Wolves usually hunt ______a team and then they share their prey (猎物).
—Does your father still smoke? —No, he has succeeded in _____smoking for three years.
—Where are Jane and her parents? —They _____ Japan.
-----I am going to have a test next week. -----__________!
There were _________ doctors, so Dr Norman Bethune had to work on his own.
My little brother caught a cold, ________ he didn’t wear warm clothes yesterday.