1．He told us whether to have (have) a picnic was still under discussion.
2．Their most valuable (value) belongings were locked in a safe in the bedroom.
3．It was no wonder that he failed again，for he had never studied hard.
4．It is well worth making (make) an effort to promote the public awareness of environmental protection.
5．Tom is a stubborn boy，so it is no use debating with him.
6．Perhaps the most difficult challenge is how to survive (survive) without friends in life.
7．On arrival at the ancient village，you can find many cultural (culture) relics.
8．Mr.Reed selected (select) to represent us in the meeting has been sent to have a talk with them.
9．I am always thinking that studying well is the only thing that I could do in return.
10．There is no doubt that what a cleaner does is harder compared with any other job in the society.
