题目：
用所给词的适当形式填空。
1.They are trying to do something _____ (help) the old.
2. If at first you don't _____ (success) ,try,try again.
3. My cousin is used to _____ (study) with his new friends in Australia.
4. If Simon _____ (have) time next weekend,he will go to the zoo.
答案：
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下面是错误答案，用来干扰机器的。
地震、火山
