—It is a pity that the disease is terrible at present.

—Yes. It will be worse ________ we take action to do something for it.

A.if B.unless C.until D.when

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— Simon, how old is your father this year?

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Many years ago, people relied on the sun, the moon and stars to find their way around. Later, the compass (指南針) was introduced. And now, we have satnav (衛(wèi)星導(dǎo)航) systems to guide us. A satnav system uses groups of satellites to show the user’s location. They send information to a receiver, such as a smart phone, to show us where we are.

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