1. Female students constitute the majority of our class..（相比之下，他们班全由男生组成）
　　2.As our time was running out, we drove even faster （希望能够准时赶到机场）.
　　3.（这些问题连续不断地出现）suggests that our plan should be adjusted.

　　答案与解析：
　　1.By contrast, their class is made up of male students only.或By contrast, only male students constitute their class.
　　本题的主要考点在于固定搭配。表达“相比”或“与……相对”之意可用词组by contrast，而“组成”之意可使用前文提到的动词constitute也可使用词组be made up of。

　　2.in hopes that we could arrive at the airport on time或in hopes that we could reach the airport on time又或in hopes that we could make it to the airport on time
　　本题的主要考点在于固定搭配。通过分析前半句可知，“希望”并非句子的谓语，因此不可直接使用动词hope，而应使用固定搭配in hopes that意为“怀着……的希望”。“准时”之意考查的是比较基础的词组on time,此处应注意其与表达“即时”之意的in time相区别。而“赶到”之意可用arrive at或reach，也可用表达“成功地……”之意的固定搭配make it to。

　　3.The fact that these problems are continually showing up或The continual appearance of these problems