3. Mr.
Smith is working.
Mr.
Smith is__________ __________.
答案:1. in
2. hears from 3. at work
简析:英语中有不少同义、近义词(组),在平时学习中要注意总结归纳。如:enjoy
oneself/have a good time, look after/take care of,difficult/hard, can/be able
to,over/more than,receive(get)a letter from/hear from等等。