1 . ________ is not difficult ________ people ________ and find a job in our city.
| A．That… of… to settle down | B．It… for… to settle down |
| C．That… for… settling down | D．It… of… settling down |
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2 . ________ has been known for some time that plants use chemicals to communicate with each other.
| A．What | B．That | C．As | D．It |
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3 . I find hard to concentrate when exposed to a noisy environment.
| A．that | B．this | C．those | D．it |
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4 . No matter where he is, he makes ______ a rule to go for a walk before breakfast.
| A．it | B．this | C．that | D．what |
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5 . Advanced technology makes ___________ possible that millions more people have been able to experience a digital version of the world-famous painting.
| A．it | B．this | C．that | D．one |
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6 . That we should wear masks in public places during the epidemic(疫情) is necessary.(用It做形式主语改写句子)
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7 . I really appreciated ______ when you lent your notes to me.
| A．one | B．this | C．that | D．it |
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8 . ________ is still not decided whether we will have a sports meet this term.
| A．It | B．What | C．He | D．That |
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9 . is a fact smoking is a danger to our health.
| A．What; that | B．It; that | C．What; which | D．It; which |
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10 . Is _______ possible to fly to the moon in a spaceship?
| A．this | B．that | C．it | D．man |
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