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____ the institution type, in the United States, students typically earn credits for courses they take and these credits count towards the completion of a program

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Some people are against children ____ to school before they are six

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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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In the early 21st century, with the _____ of mobile communication technology, the mobile phone has emerged as a new and unique channel.

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He is talking for hours but I _______ understand anything.

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_______, he can never follow me

There are four_____________ in a year.

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You will not understand the importance of foreign language learning ______

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In the past, it was misunderstand that inner body parts were ............ by the fine needles in practicing acupuncture

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The government have ____ a campaign to relieve poverty and eradicate hunger in the local area

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My flatmates want to ____________ a party, but I'm not keen on the idea

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Are you free ____ the evening? - Yes, I am

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We decided ____ a house with a swimming pool

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Do you have any objections ______ this new road scheme?

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________ do you go to school? . I walk

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Open communication among parents and children can help create ____ trust

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When did your family first ........  to America?

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The old students __________ one another in the school yard

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Parents are always willing to lend a sympathetic ____ to their children when they have problems

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What time does Nga ______every morning?

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Only then ____ the letter from my son