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| A.filled | B.marked | C.prepared | D.shown |
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| A.is finished | B.was finished | C.finishes | D.finished |
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| A.will be held | B.have been held | C.was to be held | D.would be held |
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| A.is needed | B.needs | C.will need | D.has needed |
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| A.should be built | B.is being built | C.has been built | D.was built |
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| A.were invented; were used as |
| B.were invented; are used for |
| C.was invented; was used for |
| D.invented; are used to |
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| A.sell | B.are sold | C.will sell | D.will be sold |
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