Choose the best answer:
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

Choose the best answer:
He bought all the books ______ are needed for the English course

In the spring, the weather is ………….

Choose the best answer:
This year, so far, we ____ £ 16,000 and are still counting

Choose the best answer:
I had to take $10,000 ____________ of a savings account in order to pay for the car

Choose the best answer:
I agreed that the shop treated you very badly. But just write a polite letter of complaint. It’s not worth making a _______ about it

Choose the best answer:
Be sure to put __________ your campfire before you go to sleep

______ morning exercise is good for you.

Choose the best answer:
The success of this project relies __________ everyone making an effort

Choose the best answer:
The new consultant is still feeling her ________ in the hospital

Choose the best answer:
Nowadays people are more aware that wildlife all over the world is in (01) _____. Many species of animals are threatened, and could easily become (02) _____ if we do not make an effort to protect them. In some cases, animals are hunted for their fur or for other valuable parts of their bodies. Some birds, such as parrots, are caught (03) _____ and sold as pets. For many animals and birds the problem is that their habitat - the place where they live - is disappearing. More land is used for farms, for houses or industry, and there are fewer open spaces than there once were. Farmers use powerful chemicals to help them to grow better crops, but these chemicals pollute the environment and (4) _____ wildlife. The most successful animals on earth – human beings - will soon be the only ones (5) _____, unless we can solve this problem

Choose the best answer:
I'm saving all my pocket money __________ to buy a new PlayStation

Choose the best answer to complete the sentence.

It has many letters and words. You use it to look up new words. What is it?

Choose the best answer:
She easily adapts to new environment. Clearly, she quickly settled ___________ in her new house

Choose the best answer:
In the past, health care in some rural areas of this country ____ by only a small number of doctors and nurses

Choose the best answer:
Did you know they’ve ..... their engagement?

Choose the best answer:
A: "Would you please go over my presentation on ASEAN?" - B: “____"

Choose the best answer:
 ____ dating involves couples going out together. It gives you the chance to see how your date interacts with other people

Choose the best answer:
Mary wants to speak with you. – Please tell her that I ______ her as soon as I’m free.

Choose the best answer:
James was totally hooked on her _______ performance at the annually held festival

Choose the best answer: 
Does your mother _____________ special foods on New Year?