---Seems no one knows _____ what happened to Malaysia Airline Flight 370.---It’s really sad, hope more and more resources will be offered in the search.
He thinks he can do if he his best.
I am afraid there’s ______________with my bike. Can you come and have a look?
A good doctor should be_________ to his patients.
He’d rather ________vegetables than _______meat for lunch.
Excuse me, I lost my way. Will you please tell me?