We can never expectbluer sky unless we create less polluted world.

A． a; a B. a; the

C． the; a D. the; the

[单选题]We shall never beable to [fulfill] ourselves truly unless we are working fo

[单选题]We shall never beable to [fulfill] ourselves truly unless we are working fo

we would have prevented the catastrophe.A.If we knew it earlier B.Unless we had

The manager told us never to ______ till tomorrow what we can do today.A. come u

[单选题]When we write, we must write as ______as we can.A.careful B.carefully C.mor

[主观题]We are quite sure that we can ______our present WeWearequitesurethatwecan______ourpresentdifficultiesandfinishthetaskaccordingtoschedule.A．)getacrossB)getoverC)getawayD)getoff

[单选题]We can conclude from this passage that camels ______.A． feel at home in the desertB． like to carry heavy loadsC． look like ships from a distanceD． will always be useful

[单选题]When we write, we must write as______as we can.A.carefulB.carefullyC.more c

We remain unaware of this fact unless we, or one of our close relatives, are amo

[单选题]We shall probably never be able to _____ the exact nature of these sub-atomic particles.[A] assert[B] impart[C] ascertain[D] notify