——I am afraid I can’t return the book to you before Friday.—— .
As we all know, a proper amount of exercise _______ to good health.
——Do you know who left the computer on all night long? ——It seems that Tom is_______. He played computer games yesterday afternoon
An interesting suggestion on how to measure the temperature on the moon has been______.
The manager has _____ difficulty in finding a man to take _______place of the secretary
--- I want to make a kite for my son..---____ You can easily buy one in the market.