-- Can you go swimming with us this afternoon?

-- I'd like to, but I ________ take care of my little sister at home because my mother is ill.

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________ the help of man-made satellites, we can know what the weather will be like in the next few days.

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-- I don't know how to search the Internet.

-- ________. I'll help you.

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-- May I borrow your eraser?

-- Certainly. ________.

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The teacher told Lucy ________ too much time ________ computer games.

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They asked me ________ during the May Day holidays.

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-- Do you know ________ I could pass the exam?

-- Sorry, I've no idea.

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The father wished the twins to be doctors, but ________ of them liked to study medicine.

[　　]

Mary ________ an English song at the party yesterday. She did wonderfully.

--Which would you like,a cup of tea or a glass of milk?

--________ . I'd like to drink a glass of milk.