This is ________ difficult problem that few students can work it out．

so

so a

such

such a

It's nice ________ Andy ________ me with my English study．

at; to help

of; to help

with; help

of; help

We will fly a kite as soon as your homework ________．

finishes

will be finished

has finished

is finished

They would rather ________ colours like orange or yellow than blue or white．

use

to use

using

uses

You can't sneeze and keep your eyes ________ at the same time．

open

opens

opened

opening

This piece of music ________ beautiful．

looks

sounds

tastes

smells

I ________ the charity show on TV when the telephone rang．

watch

watched

am watching

was watching

________ great man Huang Furong is!He lost his life while saving the students in the Yushu earthquake．

How

How a

What

What a

Beijing is ________ capital of China and it is ________ city with many places of interest．

a; a

a; the

the; a

the; the

There ________ many people ________ in the office, but now nobody is allowed to．

used to be; smoking

used to have; smoking

used to be; smoke

used to have; smoke