1.B
省略that的宾语从句
I don't think (that) she needs so much exercise.
2.A
We call a big meal dinner
我们把大餐叫做dinner
dinner是最正式的用法
3.A
hope sb.to do sth.
hope后跟动词不定式
4.D
除非你被叫起来,请不要在上课时站着
现在时的被动
5.B
fun不可数,用how的话应该是How great the fun is!
What a good time
time在这里可数,一段时间,可以算固定搭配了