The difficulty which we had _______ with the local people has now been removed·
A．communication B．to communicate
C．communicated D．communicating
The surface of the table ______ smooth enough．
A．hash’t felt B．isn’t feeling C．doesn’t feel D．isn’t felt
At last，we found ourselves in a pleasant park ________trees providing shade(荫凉)and sat down to eat our picnic lunch．
A．for B．from C．of D. with
.Manufacturers should have professional productivity and technical knowledge to ______ the quality of the products.
A. predict B. promise C. guarantee D. determine
.It was in the 1990s _______ we were working together ____ we made friends with each other.
A. that; when B. when; that C. that; that D. when; when
—Tom, help me buy two tickets for this weekend’s concert online.
—Sorry, there is no ticket _______ online now.
A. acceptable B. convenient C. accessible D. available
