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What time ...........................classes start?

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  “Do you know how this machine work?” 

  “All you do is just ________ this button and it starts automatically.”

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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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  It’s a hot topic, and people have ...... all morning

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  Synthetic detergents release phosphates into the water, that can cause pollution problems

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  The equipment had to be sent back to the manufacturer because it was damaged ------- repair

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  Nobody called, ________

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  Alice Freeman, ................. to head Wellesley College at age 27, is one of the youngest college presidents in history.

• Choose the best answer to complete the sentence.

  Tom sits______ Lucy and James.

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  Now you know all the facts, you can ________ an informed choice

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  It’s almost impossible for anything to grow in such a _______ landscape

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  Nowadays more and more students _____ work in mountainous areas in summers

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  Many measures ____ to improve the quality of higher education have been approved by the council

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  I hope that this winter won’t be______ last year

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  My old friend, Manh …………………… to me twice a month.

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  We _______ walk all the way home. We ________ take a taxi

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  The rainforests around the world are ____ threat of deforestation

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  To prevent noises coming from the nearby construction site, my father decided to install a _______ door

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  Hardly a day ...... when I don't think about her

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  overexposure to the sun can produce……..some toxic chemicals

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  Employees are ------- from eating outside of designated rest areas during their lunch breaks