—Why did Mr. Green take his 7th grade students to the river yesterday afternoon?—________ the river.
You can’t imagine ______ when they received these nice Christmas presents.
My new pen ______. Who ______ have taken it?
— David hasn’t come yet. —I think he will ______ soon, for he means what he says.
Many students_______from the new library since it was open to all.
The doctor ______ him to give up smoking, but he refused.