1 . The number of medical schools reached 18 in the early 1990s and ________（remain）around that level ever since. (所给词的适当形式填空）

2 . She remained _______________ (sit) there when we came in.

3 . 我的祖父人老心不老，他很幽默，常常会逗乐年轻人。(remain)

4 . By far，there are many problems that remains to be solved. (用现在分词(短语)改写句子)
→By far，there are many problems ________to be solved.

5 . 你应该在会议上保持沉默，除非被邀请讲话。(状语从句的省略)
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6 . 去年以来，这种商品的价格保持不变。(remain)

7 . 中日两国的共同利益远远大于分歧，对话与合作始终是两国关系的主流。（outweigh）

8 . 随着技术的发展以及电脑的普及，网络课程在多大程度上能取代传统教学方法还需拭目以待。 (extent)

9 . 虽然他获得了博士学位，但他是否有资格来做这个职位还有待观察。（qualified）
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