21. ---Have you heard that Tom, as well as his parents, ________ moved to Beijing ?
---Really ? No _________ I haven’t seen him for a long time.
A. have; doubt B. have; reason C. has; choice D. has; wonder
22. ---How did it _________ that all the flowers died ?
---I had forgotten to water them.
A. come on B. come up C. come about D. come along
