A.must | B.may![]() | C.should | D.would |
A.the, the | B.不填,the | C.the, 不填 | D.不填,不填 |
A.不填; the | B.the; 不填 | C.a; 不填 | D.不填; a |
A.occasion | B.case | C.situation | D.background |
A.are | B.is stayed | C.is | D.are left |
A.fixed | B.fixing | C.fix | D.to be fixing |
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