Nowadays people are convinced ___ the negative effect of second-hand smoking ___ people around.

Has the match started?– Finished! Guo Jingjing_____it.

The ______ of living areas makes wild animals becomefewer than before.

Great efforts to increase agricultural production must be made if food shortage _____ avoided

We can invite our teachers to the farewell party next Saturday.– Yes, ______ I’ll call them at once.