It is essential that these application forms ______ back as early as possible.

 Mr. Li, a man calling himself Smith wants to see you. ________ he come in?

If I ______ten years younger, I _____ very happy.

—How much of the foreign expert’s speech have you understood?—Almost nothing. I wish I ________ harder at English.

This printer is of good quality. If it _______ break down within the first year, we would repair it at our expense.