Email, as well as letters, ______ an important part in daily communication.
| A．is playing | B．have played | C．are playing | D．play |
—Ken has gone to the Africa country to work as a volunteer.
— I would rather he _____there. The situation there is very tense.
| A．didn’t go | B．hadn’t gone |
| C．doesn’t go | D．hasn’t go |
What the children in the mountain village need ______ good books.
| A．is | B．are |
| C．have | D．has |
In front of our school ______, where a lot of people play or take exercise at any time.
| A．does a park lie | B．is a park lie |
| C．a park lies | D．lies a park |
His study in Peking University lasted four years, ______ he founded his own company in Hong Kong.
| A．after which | B．after when |
| C．after that | D．after it |
I just don’t understand _______ that prevents so many Americans from being as happy as one might expect.
| A．why it does | B．what it does |
| C．what it is | D．why it is |