20．- We usually go hiking for vacation．I like it，but I want to try something more challenging this year．

- ________

A．Let’s go．　　　　　　　 B．Cheer up．　　　 C．Like what?　　　 D．Take care．

19． He was very busy yesterday, otherwise he 　　　to the meeting.

A. would come　　　 B. came 　　　　C. had come 　　　　　D. would have come