Open the window please, Mike.— ________ I didn’t hear what you said.

It is generally believed that ______a piece of field is, ______ it produces.[ ]

I wonder whom you are waiting for.—The policeman _______ the trafficaccident.

I prefer speaking to listening in English learning.—Oh, really! I think you should be good at ______ of them.

It’s a good rule to _____.