Never give up your effort, ______ you are sure to get what you’re trying to get.
----HI, Pete! Why are you in such a hurry? ----______the : train.
Would you please go and ______some water for me? I am thirsty.
A lot of meetings were ______because of the dangerous disease.
We enjoy______the moon in the open air on the Mid-autumn Day.
----Do you think Jim will pass the Chemistry exam? ----Sure. He ______a lot of time on it.