请在第_____处填上正确答案。

A . conduct B . produce C . use D . consume

A . with B . on C . by D . at

A . activities B . actions C . performances D . relations

A . make B . result C . tell D . keep

A . needs B . wastes C . areas D . resources

A . above B . to C . at D . up

A . manager B . public C . department D . firm

A . serious B . negative C . favorable D . provide

A . wellbeing B . environment C . relationship D . outlook

A . performed B . studied C . brought D . taken

A . Yet B . Otherwise C . Furthermore D . Rather

A . unthinkable B . Impossible C . reasonable D . unimaginable

A . turns B . finds C . points D . figures

A . putting B . covering C . cheating D . tricking

A . in B . for C . on D . at

A . cool B . nuclear C . star D . cold

A.If B.Unless C.Once D.While