There are many factors that ________ the popularity of the 3G cell phone．Higher speed of surfing the Internet is one．

answer for

provide for

account for

apply for

Though H1N1 is sweeping throughout the world, people are still looking forward ________ off the Carnival Parade．

to calling

not to calling

not to call

to not calling

About 15 million visitors ________ to come to the 2010 Harbin Ice ＆ Snow Festival where exhibitions of ice and snow sculptures are a highlight．

are expected

will be expected

expect

will expect

How long do you think ________ China launches another manned spaceship?

will it be until

it will be before

will it be when

it will be that

On December, 3, 2009, Philadelphia 76ers, ________ NBA team, held ________ news conference announcing Allan Iverson would return．

a; the

an;/

an; a

the;/

________, I think, and the problem could be settled．

So long as you keep up your spirits

A bit more effort

If you doubt your efforts

Making great efforts

I didn't hear the phone．I ________ asleep．

must be

must have been

should be

should have been

－Where is Tom?

－Well, he ________ you ________ here．Otherwise he would come down right now．

didn't know; were

hasn't known; are

doesn't know; are

hadn't known; were

We've been looking at houses but haven't found ________ we like yet．

it

them

that

one

－I'm not crazy．I really did see a UFO．

－Well．We'll ________ your story．

look into

look through

look over

look up