The conference has been held to discuss the effects of tourism ________ the wildlife in the area.

Whom would you rather ______ to Hainan for the holiday, Bob or Jack? —- Maybe Bob

His parents insisted that he __________English well when he was in junior school.

The boys even have no time for their homework_________ the basketball match.

______ he talked with her for a long time, he failed to convince(说服)her.