例：It’s so nice to hear from her again. , we last met more than thirty years ago.
A. What’s more B. That’s to say
C. In other words D. Believe it or not
21. Some animals carry seeds from one place to another, ______ plants can spread to new places.
A. so B. or
C. for D. but
22. ---Hi, let’s go skating.
--- Sorry, I’m busy right now. I _______ in an application form for a new job.
A. fill B. have filled
C. am filling D. will fill
23. Jane is in a hurry because the train to the airport leaves _______ half an hour.
A. by B. in
C. for D. until
24. ________carefully if any change occurs when doing experiments in the lab..
A. Observe B. To observe
C. Observed D. Observing
25. Last night, there were millions of people _______ the opening ceremony live on TV.
A.watch B. to watch
C. watched D. watching