题目内容
Bikes ______ be put in front of the shop.
用情态动词（can, may, must, need, have to, be able to）的正确形式填空：
Mr Black said to Jenny White, "If you can't get here on time, I ______write to your father."
His father ______ work for a landlord （地主）in his childhood.
The young man over there ______ be at least twenty-five years old.
