21. —How much difficulty did you have_____ the problem?

—_____. It’s quite easy.

A. to solve; Nothing B. to solve; None   C. solving; None   D. solving; Nothing

22. “You can have some cakes, _____ you must wash your hands first.” Mum says.

A. and              B. or                 C. but          D. so

23. This pair of jeans looks nice _____ Sandy, because she looks very nice _____ blue.

A. on; in               B. in; on             C. for; on          D. to; in

24. The twins are in different classes. One is in Class One and_____ is in Class Two.

A. another          B. other              C. the other        D. others