5．They are too young to understand such things.

4．Make sure that you turn off the lights when you leave the room.

3．You may not rely on the weather report.

2．We have to make three loads of the cargo.

5．他们太年轻还不懂这些事情。(too...to)

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答案：1.The waiter attached a label to his luggage.

4．确保你离开房间时关上灯。(make sure that)

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3．天气预报不足为信。(rely on)

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2．我们得把货物分装三车(船)。(load)

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1．那个服务员将一张标签贴在他的行李上。(attach)

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9．The new medicine________the spread of the disease.

A．arrested　 B．improved　 C．kept　 D．supported

解析：句意：“这种新药阻止了这种疾病的传播。”考查arrest即“阻止”。keep...from...是阻止，B、D不合语境。

答案：A