Have you been here before—Yes. This is the third time that I ______ to Shanghai.

I’m afraid I can’t finish the book thisweek— ____

Humans’ activities have pushed some endangered animalsinto a situation we will probablynever see them

“May I speak to your manager Mr Williams at five o’clocktonight”— “I’m sorry Mr Williams ________ to a conference by then”

You can’t expect the reward to be ____ to the effort; the process of learning is more important.[ ]