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【題目】We can’t figure out ______ quite a number of insects and birds are dying out．

【題目】From his tired face, I can tell he _______ in the queue for a long time.

【題目】We are ________ by doctors to eat more natural food and take plenty of physical exercises.

【題目】False advertisements play tricks on consumers, thus ______ damage to their legal rights and interests.

【題目】My best friend who _______ a rich man two years ago has a baby now.

【題目】In his fifties, he _______ fishing as his favorite hobby.

【題目】________ on the book, he was attracted by its plot.

【題目】________ around the Water Cube，we were then taken to see the Bird’s Nest．

【題目】— I don't know how to spend my weekend.

【題目】 --- John’s report has been approved by the chief editor.