A.is needed | B.needs | C.will need | D.has needed |
A.should be built | B.is being built | C.has been built | D.was built |
A.were invented; were used as |
B.were invented; are used for |
C.was invented; was used for |
D.invented; are used to |
A.sell | B.are sold | C.will sell | D.will be sold |
A.is answered;other | B.answers; other |
C.is answered; another | D.answers; another |
A.create | B.creates | C.creating | D.created |
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