29．Have you ever ________ a horse ? (ride)

28．Many of his _________ (invent) were very useful.

27．Read the book as __________ (quick) as you can.

26．Fish can’t live ______ (with) water.

25．Don’t make noise, the baby is ________ (sleep)

24．His mother hates _______ (travel).

23．He writes _______ (careful) than Mike.

22．The classroom is ________ (noise) because some students were talking _______ (noise).

21．The _____ (foreign) is from England.

20. I’m ______ to trouble you.

　A. glad　　 B. afraid　　 C. fear　　 D. sorry