. Stressful environments lead to some unhealthy behavior such as a poor eating habit, which _____ increases the risk of heart disease.
| A．in turn | B．in return | C．by chance | D．by turns |
As we know, fresh air and proper amounts of exercise can____ good health.
| A．link to | B．contribute to |
| C．depend on | D．concentrate on |
The computer system____ suddenly while he was searching for information on the Internet.
| A．broke out | B．broke in |
| C．broke up | D．broke down |
The Chinese National Football Team won the game, ____ made us excited.
| A．that | B．which | C．what | D．who |
____ people were said to enjoy a “5-D” light show during the New Year celebrations in Shanghai.
| A．A large amount of | B．A large number |
| C．A good many | D．A great deal of |
Would it be ____ for you to pick me up at four o’clock and take me to the airport?
| A．free | B．empty | C．kind | D．convenient |