—Has your friend completed his design?—Not yet. He _______ on it last night.
----It’s very kind of you to carry the box for me. ---- __________.
Good hobbies can help us _________and make our Iives _________
----Do you know_____ second-hand smoke? ----To prevent our health and memory.
---- Will you buy this tie for Dad? ---- I have no idea. I don’t know or not the colour matches his new shirt.
The child is too young to_________ himself.