My parents have promised to come to see me before I ______ for Africa.
When Peter speaks in public,he always has trouble ___ the right things to say.
Tony lent me the money, ___ that I’d do as much for him.
不守时是她的典型特征 Keeping others waiting ___ her.
AIDS control and prevention is a ___ to China as well as the whole world.
The fresh air on the farm ___ him ___ his headache.