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A good knife is probably one of the most useful things you can have in a kitchen

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Many groups worldwide are trying to develop vaccines that protect against a wide range of coronaviruses and prevent (26) _______ pandemic. These efforts have now been boosted by the discovery that some healthcare workers had pre-existing immunity to the SARS-CoV-2 virus during the first wave of the pandemic. During the first half of 2020, around 700 healthcare workers in the UK were tested weekly as part of a crowdfunded study called Covid Sortium. Most of these people, who wore protective equipment, never tested positive for covid-19 in PCR tests or developed covid-19 antibodies – proteins that (27) _______ to the outside of viruses, preventing cells from being infected. (28)_______ , when Leo Swadling and Mala Maini at University College London and their colleagues looked more closely, they found some of those (29) _______ tested negative had a protein in their blood that is linked to covid-19 infection, as well as T cell responses to the SARS-CoV-2 virus. T cells are (30) _______ of the immune system

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This charity provides financial support and mental comfort to ____ children

Choose the letter A, B, C or D to complete the sentences. “…………………..” “I’m ten years old.”

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Students often use their calculators to solve tricky questions, _______ ?

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They should finish the tasks ______ without depending anyone

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There are ______________ buildings in this city. There aren’t enough parks for children

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Few people can do creative work unless they are in the right _______ of mind

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Nam seldom goes fishing, ______?

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------- our factory is to maintain its relationships with our retailers, we must increase production

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Americans believe that the 50 states make ____________ a union that is greater than the sum of its parts

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The teacher has _______ come into the principal's room

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………., a brick fell on his head

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The pain and violence of his childhood were ...... into his marriage

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If only I ____ the books on the reading list before I attended the lecture on My Son sanctuary

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Your parents ________ angry if you ________ playing computer games

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Not until we the school for children with disabilities ____ how they ____ overcome difficulties

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I'd like to _____________ you all at your ease and assure you that there will be no layoffs, so please do not listen to the rumors going around.

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It’s high time to _______ a stop to bullying and body shaming in schools

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A: “____” - B: "I've just asked where you are from."

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After a busy day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recovers from the (26) ______ of the previous day. The rest that you get while sleeping enables your body to prepare itself for the next day. There are four levels of sleep, each being a little (27) ______ than the one before. As you sleep, your muscles relax little by little. Your heart beats more slowly, and your brain slows down. After you (28) _____ the fourth level, your body shifts back and forth from one level of sleep to the other. Although your mind slows down, you will dream from time to time. Scientists who study sleep state that when dreaming (29) ______ , your eyeballs begin to move more quickly. This stage of sleep is called REM, which stands for Rapid Eye Movement. If you have trouble falling asleep, some people recommend breathing very slowly and deeply. Other people believe that drinking warm milk will make you (30) ______. There is also an old suggestion that counting sheep will put you to sleep