I was doing my homework _______ a dog came in.
The policeman caught the thief ______ has stolen Mr. Li’s computer.
—Miss Gao, I am feeling bored. Would you mind my ________ here? —You had better not, for smoking is forbidden in public now.
There _____ an English speaking contest(演讲比赛) for middle school students in our city in early July.
Those toys for children look _______ and sell _______.
A big party was held in NO.18 Middle School last night, the teacher with students _____ singing and dancing happily at the party.