This is _____ and we must _____ on it.A hard work; work hard B a hard work; work hardC hard work; hard work D work hard; hard work
The mobile phone has changed people’s life a lot ________ it was invented.
I have so much homework to do that I don’t know ________.
---- You don't know what great difficulty I had _____ to get the two tickets. ---- But the film is really worth_______ twice.
— You should be careful when ________. — Yes, I will. I’d like to know when ________ to have a rest.
The red shirt doesn’t suit you. I think that black one __________good _________ you.