The accident happened ________ a cold winter morning.

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We should keep our eyes ________ while doing eye exercises.

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English ________ in many countries.

The students ________ photos in the park now.

I usually walks to school, but ________ bus when it rains.

It's very hard ________ English well.

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We'd like to have ________ to read.

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Most people speak English ________ a second language.

It's easy ________ her to answer this question.

I study for a-test by listening ________ cassettes.