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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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Today we ______________ electricity for granted and perhaps we do not realize just how useful this discovery has been.

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He dropped ________________ the race after two laps

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Our guests are from a ________ of society and so should reflect most point of views

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On his 22nd birthday party, he was given a _______ motorbike

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People talk about the generation gap as a kind of division between young people and their parents. It is something which is generally a problem when children enter their teenage years, and results (43) complaints on both side. Parents, for example, can often be heard to say that young people are (44) ______ and disobedient and in addition tend to be irresponsible when spending because they don’t appreciate the (45) ______ of money. Adolescents, on the other hand, complain that their parents don’t understand them. What has gone wrong? One explanation lies in (46) ______society has changed. In the past, children would typically continue the way of life of their parents. In today’s world, parents are very (47) ______ for their children because they want them to achieve more than they did. The problem is that the children often don’t agree with their parents’ plans. Teenagers also reach maturity at an earlier age than they used to and want their independence sooner. The resulting conflict is painful to both sides

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Stocks in the company have gone ____________ for the third straight week in a row

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The official reported on the accident was a…..of lies

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He's taken a lot of smoke __________—he needs medical attention right away

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Three prisoners ___________ from the prison in May

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Please turn the water ____________ when you're done brushing your teeth

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Melissa and Mike will be exhausted. They ________ slept for 24 hours.

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I don't want to upset my mom during the holidays, so I am acting _________ the part of dutiful daughter

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He was useless while using the knife, so he cut _____

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If you do not make a payment by the due date, a service ------- of two percent will be added

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Health authorities have activated their most serious response level,...?

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The U.S. _____________ the lead in declaring war on terrorism.

Choose answer A, B, C or D with the defferent meaning. (twenty  /twelve  /eight /name)

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I don’t usually lend people money, but in your case, I’ll _____________ an exception.

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The accident was my fault. I am disappointed with _____

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Michael never ............  before 11