1 . The Smithsonian National Zoo in Washington, D.C, kicked off a six-month ________ (celebrate) of the 50th anniversary of the arrival of two giant pandas.

2 . The policeman stopped and spoke to the koala about the dangers of running across streets. But it ________ (not work).

3 . —Can you play ________ guitar?
—Yes, I can.

A．the

B．a

C．an

D．/

4 . My little son won’t go to sleep ________ I tell him a story every night.

A．when

B．if

C．unless

D．because

5 . There will be an e________ next week, so we all study for it to get good grades.

6 . The news was exciting.（改为感叹句）
________ ________ the news was!

7 . It is ________ to keep others waiting in many western countries. (polite)

8 . What I need are ________ (筷子), not forks.

9 . The tree has green l________ all year round.

10 . 是否能做好这点取决于你的学习习惯。
Whether or not you can do this well ________ ________ your learning habits.