y. We ___ a binding contract last year and it ___ recently
1. signed \ has been prolonged
2. have signed \ prolonged
3. have been signed \ prolonged

u. He allowed the goods___ by airplane
1. to be send
2. to be sent
3. be sent

i. He watched the children ( writing\ write\ written) the dictation

o. When I left, they were all working (hard \ more hard \ hardlier)

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