(2013·重庆模拟)—When did your brother begin to show his interest in medicine? —It was a Saturday he noticed his classmate experimenting on a frog in the lab.
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---Where did you come across our Chinese teacher ? --- It was in the supermarket ______I purchased mooncakes．
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When someone gets old they often go to live in a home with other old people ________ there are nurses to look after them.
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The woods are remains of a huge forest once covered the whole area.
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When deeply absorbed in work, ______ he often was, he would forget all about eating or sleeping.
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The school has developed an online system________ students can choose their own teachers.
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