A teacher's________to the cause of education is worth great respect of the whole society because it brings countless benefits to the development of society.
Hurry up! Alice and Sue are waiting for you at the school gate. -Oh! I thought they _______ without me.
They ______ on the program for almost one week before I joined them, and now we ____ on it as no good results have come out so far.
---What’s that terrible noise? ---The neighbors ____for a party.
--- Hi ,Tracy, you look tired. --- I am tired. I ____the living room all day.
---- Isn’t it hard to drive downtown to work? ---- Yes, that’s why I ____ to work by train.