按要求完成句子。
1.We search for a lot of things at night (对划线部分提问)
_____ _______ you ______ for a lot of things?
2.saw/ I/ interesting/ bird/ in/ an/ a/ book (.) (连词成句)
____________________________________
3.They can find out about countries. (变否定句)
They ______ _______ out about countries.
4.Mary sends an email to her friend. (变一般疑问句)
_____ Mary _____ an email to her friend?