To some life is pleasure, but to ________ it is suffering.

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—Are there any students in the classroom?

— ________ .

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　　A: He was nearly drowned once.

　　B: When was ________ ?

　　A: ________ was 1998 when he was in middle school.

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________ who break the law will be punished.

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The air in the country is fresher than ________ in the city.

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Please come in and make ________ at home, boys!

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These are not ________ belongings, but some books of ________ are here.

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—Who is knocking at the door?

— ________ .

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Niagara Falls is a great tourist ________ , drawing millions of visitors every year.

[　　]

Both Marx and Engles were ________ .

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