We cannot figure out ________ quite a number of insects, birds, and animals are dying out.

Living in the country，Peterdoesn’t write often，but we do hear from him________.

Jack, could you tell me — Sure. In the post office on Green Road.

Miss Tang teaches _______ and we all likeher class

r,in recent years, ___Three Gorges have come to be appreciated more for theirnatural beauty as ___ wonder of Nature