These shoes look very good. I wonder ___.

A. how much cost they are                        B. how much do they cost

C. how much they cost                                    D. how much are they cost

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

__ 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

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

A. which              B. that                         C. when                             D. why

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

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

A. that                  B. what                       C. why                        D. how

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

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

A. that                  B. where                      C. what                       D. which

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

A. Improving               B. To improve             C. Having improved      D. Improved

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