China has promised to revise its existing regulations and ________ new policies according to WTO requirements.

A．forming

B．to form

C．to be forming

D．have formed

In the dream Peter saw himself ________ by a fierce wolf, and he woke suddenly with a start.

A．chased

B．to be chased

C．be chased

D．having been chased

________ the employees' working efficiency, the supervisor will allow them to have a coffee break.

A．Improving

B．To improve

C．Having improved

D．Improved

You can find whatever you need at the shopping centre, ________ is always busy at the weekend.

A．that

B．where

C．what

D．which

There are hundreds of visitors ________ in front of the Art Gallery to have a look at Van Gogh’s paintings.

A．waited

B．to wait

C．waiting

D．wait

David said that it was because of his strong interest in literature ________ he chose the course.

A．that

B．what

C．why

D．how

Just in front of our house ________ with a history of 1,000 years.

A．does a tall tree stand

B．stands a tall tree

C．a tall tree is standing

D．a tall tree stands

Doris' success lies in the fact ________ she is co-operative and eager to learn from others.

A．which

B．that

C．when

D．why

________ most of the earth’s surface is covered by water, fresh water is very rare and precious.

A．As

B．Once

C．If

D．Although

Some experts think that language learning is much ________ for children as their tongues are more flexible.

A．easy

B．easier

C．easily

D．more easily