His father used to ________ a bus to work.

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Why do you think _________?

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-- Why is she worried? 

-- She's worried ________ her test.

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The man ________ be Mr Wu. Because he gone to Japan with his wife.

________ is this book?

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Sandra didn't come to school today. I think she ________ be ill.

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The baby stopped ________ when she saw her mother.

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The policeman ________ advice ________ road safety.

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Half of the class ________ most of the work. The rest ________ really difficult.

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They cooked a hen ________ over the fire and soon a delicious smell came out.

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