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【題目】—Do you believe that American flags are made ____ China?

【題目】How many _____ can you see in the picture?

【題目】 －There’ll be a new film tonight.

【題目】I have been a member of the Singing Group ________ last month.

【題目】Earthquakes always happen , so it is difficult to know when they come.

【題目】How can I(保存) these photos?

【題目】Waste water from factories must ____ before pouring into rivers or lakes.

【題目】There are many(文件) on the computer.

【題目】I have to go now. My friends ______ for me outside.

【題目】--Who ______ to clean the classroom last weekend?