In science fiction we read of flying saucers travel through _____ space, so people want to have ______ better knowledge of the universe.
| A．the; a | B．/; / | C．the; / | D．/; a |
___ 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 |