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

The woman pulled her hat low down ________ her eyes in order not to be recognized by the angry crowds．

under

below

on

over

Everybody likes to work with ________ is reliable and easy to get on with．

whom

who

whomever

whoever

－Well, a soup, a salad, and anything ________, sir?

－An apple pie, please．

follows

to follow

followed

following

－Have you heard about Apple iPhone 4?

－Sure．It is very hot these days．I'm thinking about getting ________．

one

them

that

it

－Hi, Bob, I can't find my electric shaver!

－Sorry, I ________ it and I guess I put it on the top shelf with my things．

used

had used

am using

was using

－Look, the paint is starting to come off ________ the wall is damp．

－Well, we'd better have the wall repainted some day．

when

where

if

once

－Hey!Here is a message on my cell phone, telling me to send money to…

－Delete it!It's a trick．Many a person ________ by such tricks．

has been cheated

have been cheated

were cheated

was cheated