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【題目】In summer, you’d better wear ______ pair of sunglasses to protect your eyes from ______sun.

【題目】— Would you do me a favor and carry these books?

【題目】The mixture of better jobs and greater chances of self-promotion is _____ lies behind the return of oversea Chinese high-tech talents.

【題目】Life doesn’t count for much _____ you’re willing to do your small part to leave our children a better world.

【題目】The _____ of life, is not in never falling, but in rising every time we fall to repeated attacks.

【題目】It seems that pigeons have a compass inside them that tells them _____ they need to go. That is why they never get lost.

【題目】I don't skate now, but I ____when I was a kid.

【題目】You can’t move in right now. The house _____ now.

【題目】She seems to be gentle, but she can _____ with anger when she is treated unfairly, which is surprising.

【題目】—How long _____each other before they _____here?