21. - Do you think confidence plays_______ important role in our study?
- Yes. I think it is a key to_______ success.
A. an; a B. £¯; £¯ C. an; £¯ D. £¯; a
22. It's impolite_______ him_______ his seat to the old lady on the bus.
A. of; to give B. for; not to give C. of; not to give D. of; don't give
23. I think the tough task may_______ the volunteers 2 days_______.
A. spend; to finish B. take; to finish C. spend; finishing D. cost; to finish
24. -I am getting fatter and fatter these days.
-You should have more vegetables and fruit_______ so much meat.
A. instead of B. because of C. plenty of D. instead
25. I'd like to buy my grandpa a hearing_____ as his 70th birthday present____ his poor hearing.
A. skill; because B. aid; because of C. case; because D. mark