根据句意，写出括号内所给单词的适当形式。
【小题1】Do you think it’s good for you to keep worries to yourselves (your), boys and girls?
【小题2】In China, it’s being much harder (hard) for people to pass the driving tests.
【小题3】The government has realized the importance of the safety (safe) of the children who take a school bus.
【小题4】More and more teachers feel worried about some teenagers’ (teenage) strange behaviour.
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解析：
【小题1】考查固定短语。keep worries to oneself“把担忧放在心里”。根据boys and girls可知，用反身代词的复数形式。故填yourselves。
【小题2】考查比较级。much修饰形容词、副词的比较级。故填harder。
【小题3】考查词性转换。of后跟名词、代词、动名词。Safe的名词是safety。故填safety。
【小题4】考查名词所有格。复数名词要先变为复数形式，再在词尾加“’”。故填teenagers’。