用所给动词的适当形式填空：

(employ, wait, happen, break, visit, play, take, save, learn, ask)

Much time ________ if you do it like that.

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His wife died, so that she left him with three children.

His wife died ________ ________ ________ three children.

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Although he has a lot of money, he is unhappy.

He is unhappy ________ ________ a lot of money.

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The teacher went out of the classroom, followed by his students.

The teacher went out of the classroom ________ ________ ________ by his students.

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Being ill, he couldn't come to school today.

________ ________ ________ ________, he couldn't come to school today.

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Water does not boil until it is heated to 100℃.

Water does not boil until ________ to 100℃.

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Hearing the news, they were much surprised.

________ ________ ________ the news, they were much surprised.

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It's a pleasure for me to be invited to speak here.

________ ________ ________ ________ invited to speak here.

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Is there anything else I can do for you?

Can I help you ________ ________ ________ ________?

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Those who act properly are welcome.

The people ________ ________ ________ ________ are welcome.