Whether and how ________ the meeting hasn't been decided yet.

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Some experts advise that steps ________ to protect the river at once, otherwise it's dangerous for people to drink the water.

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They were accused of ________ him in his escape.

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He's got himself into a dangerous situation ________ he is likely to lose control over the plane.

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--- ________ I speak to Mr Smith?

--- He ________ come to the phone right now. He is busy.

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You ________ pay too much attention to your English learning, as it is so important.

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Do more speaking, I think, ________ you'll improve your spoken English.

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Don't use words, expressions, or phrases ________ only to people with specific knowledge.

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I'm afraid I can't help ________ the room because I have a lot of work waiting for me.

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Children normally feel a lot of anxiety ________ their first day at school.

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