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【題目】Which country found lovely music is good for people’s hearts?

【題目】We cannot figure out _______ quite a number of insects, birds, and animals are dying out.

【題目】What does the woman like collecting best?

【題目】To protect the rare birds better, scientists have been_____ the changes in their number in the past decade.

【題目】You should keep those old jam bottles ----you never know ______ you might need them.

【題目】The news has spread all over the country ________ the spaceship succeeded in returning to the earth.

【題目】Anderson made the announcement at the conference______the company would be closing.

【題目】After three days' waiting, there was a little doubt in the mother's mind _______ the police could find her lost child.

【題目】---Will you go to the picnic tomorrow?

【題目】Nowadays people become more practical and buy only _______ they need.