Once infected with HIV, the body is unable to ________ itself against diseases．

defend

judge

save

prevent

Trees are good for man．We can't plant them ________ many．

so

such

too

enough

________2010 Shanghai World Expo was ________ honor for all of the Asians．

The; the

不填; an

The; an

不填; the

Jack, I'm afraid I'll turn to you．I think chemistry is ________ physics．

as a difficult subject as

a subject the same difficult as

as difficult a subject as

the same difficult subject as

A successful life is a life ________ challenges are met and difficulties overcome．

which

where

what

that

The magnificent tower must be saved, ________ the cost!

however

whichever

whatever

wherever

With everything arranged properly, the project is surely to ________ smoothly as planned, step by step．

improve

progress

increase

occur

Jackie, you ________ hang all your clothes in the room like this!

wouldn't

needn't

mustn't

oughtn't

It was so dark in the cinema that I could hardly ________ my friend．

turn out

bring out

call out

pick out

________ so delicious, the food in this market was sold out soon．

Tasting

Tasted

Having been tasted

Being tasted