I didn’t know when he     back. He said he would call me when he     home.

—Will the match be cancelled because of the bad weather?—No, rain or shine, the match will be held as     .

 After retirement, learning a musical instrument may be harder than ______ when you were a kid.

I don't like ______ as you read.

________ is known to all is that effective measures should be taken to deal with the problem of the over­exploitation of our resources.