A.has tried; stop | B.have tried; keep | C.has been tried; prevent | D.have been tried; prevent |
A.It | B.As | C.What | D.Which |
A.closely; takes | B.close; catches | C.near; makes | D.nearly; burns |
A.when | B.what | C.which | D.how |
A.Now that | B.Although | C.As soon as | D.So long as |
A.actions | B.measure | C.steps | D.efforts |
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