He can't finish the task in time if nobody helps him．（保持句意基本不变）
He can't finish the task in time ．
Lucy exercises every day to keep fit．（对划线部分提问）
Lucy exercises every day？
We held a welcome party for the exchange students yesterday．（改为否定句）
We a welcome party for the exchange students yesterday．
wait practise give serve return
56．Mum will not let Simon go out next time unless he home before dark．
57．﹣Who us a talk on how to protect the environment next Monday？﹣Mr. Smith is．
58．We are sure that he will win the game because he a lot for it．
59．─What's wrong with you，Jane？
─I'm a little sick and I for Dad to take me to the hospital．
60．Tim is a manager now，but he once as an engineer for five years．
he five true colour discuss
51．To tell you the ，I'm afraid to see him．
52．My bag is full．Put your books in ．
53．The students are having a hot about their future plans．
54．On her day in Guilin，Melissa took a boat trip along the Lijiang River．
55．﹣I hear there are many clubs in your school．﹣Exactly．Our school life is really ．