—How did your mathematics exam go？—I thought I           ，but in fact I fell behind in the class.

The doctor from Shanghai recommended that the patient ___________.

．—Do you feel like ________ there or shall we take a bus? 　　  —I’d like to walk. But since there isn't much time left, I'd rather we________ a taxi. 

Simon is very regretful. If he had been more careful, he _____ such a big mistake.

Children＿＿＿＿＿＿＿＿in public very often.