William, as well as his friends，________invited to my birthday party the day before yesterday.
| A．is | B．was | C．are | D．were |
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 |
___ 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 |