Ⅰ.单句语法填空
1．Only when Lily walked into the office did she realize that she had left the contract at home.
2．Was it that Stanley failed the driving test again that made him depressed this morning?
3．It was because he missed the train to London yesterday that you met him there.
4．Into the dark classroom walked(walk)Cindy，who was surprised and moved when every student sang “Happy Birthday” to her.
5．Convenient as/though__they are，these apps present problems to both parents and teachers.
6．There is no need to worry about him as he is clever and experienced.
7．Not until the train pulled into the next station did__Mary find her suitcase gone.
8．Surround(surround)yourself with positive people，and you will keep focused on what you can do instead of what you can't.
