call back 回电话；召回；再次访问
call off 取消
[小试] 用以上含有call的常见短语的适当形式填空。
1. Typing is a kind of work that _______ skill and speed. 2. The movie about overseas students _______ memories of my life in America.
3. The government _______ all the people to fight against bird flu.
4. “A lovely day!” my brother _______ happily when he went out.
5. The search was _______ because of the thick fog.
Key: 1. calls for 2. calls / called up
3. called on / upon 4. called out 5. called off