Where shall we eat tonight?—Let’s call Harry. He ____ knows the best places to go.

Will you come to the dinner party?—I won’t come unless Jenny ___________。

I don’t want to watch TV this evening. I’ll listen to music _________.

Claudia, are you going to Jeff’s birthday party on Saturday?-Unless I______ .

A number of birdwatchers ______in Zhalong Nature Reserve. The number of them____500.