题目内容
________ when his parents will come back home, the little boy chose to watch TV to kill time.
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More cycles have been shared in our city, ________ it much easier for the bus drivers to drive on the road.
You can spend three days ______ the rainforest with a local guide.
With time _________, I gradually realize the importance of health.
Look ! The building ________ now is our teaching building .
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