-How amazing it is that astronauts are exploring outer space!-It’s a challenge, I guess, ______ man against nature.
It’ll be only a few days ______ the Spring Festival comes round.
______ with it, the worried person at last smiled.
There is no doubt ______ they did a completely bad job at that very moment.
Playing computer games ______ much of his time.
Our teachers often suggest we ______ take it easy when facing any difficulty.