Wei Fang is young,but she plays ping-pong ____ her mother.
--- You don't know what great difficulty I had _____ to get the two tickets. --- But the film is really worth_______ twice.
The chance will be given to only ________ students, so ________ of you should try hard to catch it.
The food in the fridge _________ bad. Throw it away, please.
--- You should be careful when ________. --- Yes, I will. I’d like to know when ________ to have a rest.
I prefer ________ at home ________ some reading to ________ shopping.