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【題目】You will miss the chance ________ you go home now. Please think about it again.

【題目】—What’s that noise, Sam?

【題目】We ________ each other since I came to Beijing, but we send emails very often.

【題目】I ___________ on the computer when Frank called me last night.

【題目】If you take this train, you _________ in Shanghai in five hours.

【題目】Zhaozhou Bridge is one of ________ stone bridges in the world.

【題目】—______________ do you visit your grandparents, Tom?

【題目】—________ you give me a hand? I can't move the box by myself.

【題目】Wash your hands before meals, ________ you may get ill.

【題目】Usually I make breakfast for my family ___________ Saturdays.