A.are | B.is | C.were | D.was |
A.are | B.were | C.be | D.is |
A.are difficult | B.has proved difficult |
C.is supposed difficult | D.have been found difficult |
A.are | B.were | C.is | D.was |
A.are | B.are going to be | C.is | D.is to be |
A.have | B.has | C.there is | D.there are |
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