He was really disappointed to find that he had failed to make himself ______, although he tried his best to describe vividly.
Mrs. Smith has three sons, two _____ have gone to college.
If you don’t go swimming this afternoon, she won’t go. _____.
When we got to the airport, the plane was starting _____.
The river _____ are covered with trees is very long.
-----Tim, please don’t talk in class. -----Pardon? -----I _____ talk in class.