This math problem is _________ thatone.[ ]

Why do English people talk so often about the weather when they start a talk? — Because the weather is a(n) ________ topic (话题).

The more ______ you listen to the tape, the ______ you will find it to understand.

Why are you late, Jim?—Because there _________ a lot of traffic when I came here.

This is the very reason ______ he gave for his coming late to the meeting.