Students often spend lots of time _____ their homework. A to do B do C did D doing
----Whose book is this?----It _______ our geography teacher’s. You see, his name is on it.
It seems that the aged people _________ the H7N9 more easily from the recent cases.
---I’m very sorry. I broke your tea cup. ---________.
--Is Kate serious? ---I _________. She never means it.
---Morning, class. Is _________ here? ---No, sir. Tom is absent.