Mr. Greento the manager now. You’d better call him later.

Is this the first time you _____Chengdu ?—-No. But the first time I _____here, the city wasn’t so beautiful.

Look! Mrs. Green is talking ____ the students of ClassⅠon the ground. [ ]

Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ______ we should deal with properly.

All of us found ________ hard to get along with him, he was too strict with others but not with himself.