Wang Ping hesitated for ___ before he ___ to the question.

If we leave right away,____ we’ll arrive on time.

Two middle-aged passengers fell into the sea. _______, neither of them could swim.

As these goods are of different styles, the prices ___ 100 yuan to 9 yuan.

-- Do you think it's a good idea to make friends with your students?--  _____  , I do. I think it's a great idea.