1. While waiting for the opportunity to get , Henry did his best to perform his duty.
A. promote B. promoted C. promoting D. to promote
2. Last night, there were millions of people _______ the opening ceremony live on TV.
A. watch B. to watch C. watched D. watching
3. There are still many problems ______ before we are ready for a long stay on the Moon.
A. solving B. solved C. being solved D. to be solved
4. The film star wears sunglasses. Therefore, he can go shopping without ______.
A. recognizing B. being recognized
C. having recognized D. having been recognized
5. Toady there are more airplanes _____ more people than ever before in the skies.
A. carry B. carrying C. carried D. to be carrying
6. __ the past year as an exchange student in Hong Kong, Linda appears more mature than those of her age.
A. Spending B. Spent C. Having spent D. To spend
