Where ____ your mother work? She worked in a shop.
A. do B. does C. did
My trousers ____ dirty, so I washed them.
A. were B. was C. are
This letter is _______ Lucy.
A. fromB. of C. on
读句子，从中选出恰当的答语，将序号填在题前括号内。（共10分，每小题2分）
（1）Where do you live?A Fine. It’s snowing.
（2）Why are you worried?B Because my cat is missing.
（3）Would you mind opening the door?C Speaking.
（4）May I speak to Guoguo? D I live in the forest.
（5）How’s the weather in Beijing? E Sure. No problem.
---Would you please ______ the door?
A. open B. to open C. opening