—Where did you go _____ vacation? — I went to Hong Kong.A. for B. in C. on
To save water, the parents told their children ________ their teeth under a running tap.
Mr. Lee spent the final time of his life in writing after finding out that he ________ soon.
Father was very angry because his favorite glass ________ by his pet dog.
.The school meeting ________ once every two weeks in the concert hall.
I didn’t know ________ the professor would give us a lecture in the hall.