When the teacher asks him, he always ____.

When shall we go to the Xuanwu Lake Park, this Saturday or Sunday—________ is OK. I’m free on the weekend.

The young scientist has made such great achievements in his chosen field ______ nobody else can make.

Liz’s painful story________us with a clear example of the dangers of drug abuse.[ ]

The Red Cross is expected to send help there is human suffering .