_________ people were watching the sky, the alien got out of the UFO.

_________ people were watching the sky, the alien got out of the UFO.

#57263

When

Because

While

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The rivers will become dirtier and dirtier ______ we take action to protect them.

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since

until

unless

Keep your child off drugs,  ________ it will ________ many serious health and behavior problems.

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or; point to

or; lead to

and; point to

and; lead to

Jenny enjoys reading and spends a lot of money on books    __   she is not rich.

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when

because

though

Hurry up, _______ you can’t catch the first train.

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and

but

—________ does he often go to Beijing?   —By plane.

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How

When

Where

Which

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