The project my students are working is quite challenging because it involves many professional skills[ ]

We mustn’t waste anything.____, you shouldn’t waste time.[ ]

Guess what! I have got A for my term paper. —Great! You _______ read widely and put a lot of work into it.

The villagers used to______ drinking water from theriver nearby, but now they spend two hours _______ to get it in the mountainbecause of the dry weather in Yunnan.

16．Julia _____ with a stranger when Jim went to the jacket he _____ in the restaurant