87．The party began ten minutes ago but the new couple hasn’t appeared．

It is ten minutes since the party began but the new couple hasn’t______ ________．

86．We don’t allow children to play football in the street．

Children are________ ________play football in the street．

85．Smoking has a bad effect on our health．

Smoking________our health greatly．

84．We visited the factory yesterday．The tractors are produced there．

Yesterday we visited the factory_______the tractors are produced．

83．His parents always take pride in his good behavior at schoo1．

His parents_______always_____ ______his good behavior at schoo1．

82．It seemed that he had realized his mistake．

He seemed_______ ________ _________his mistake．

根据上一句的意思，完成下一句，每空一词。

81．I would like to make friends with you．

I_______ _______making friends with you．

80．He told me he was much________(羞愧)of having lied to his mother．

79．Some of the students had_______(体验)hardships before they entered the university.

78．You should give me a clear_______(解释)of your conduct．