On hot summer days,quite some students feel _s____in class.They can't listen to teachers carefully.
问题描述：
On hot summer days,quite some students feel _s____in class.They can't listen to teachers carefully.
答
如果只有C和D, 那肯定不是C. 所以选D. 这跟keep这个词的用法有关 不知道怎么解释 但是A应该是最恰当的. A 四D吧。。。
答
upset
On hot summer days,quite some students feel upset
in class.They can't listen to teachers carefully.
在炎热的夏天，很多同学上课的时候会觉得不安（沮丧）。他们不能认真听老师讲课。
答
填写sleepy ,昏昏欲睡的,困倦的
答
scorched像烤焦的。。。。