—Why do you drink so much coffee —Well, ______ it doesn't keep me awake at night, I see no harm in it.

—Our vacation was Yes, I'ye never had ______.A．greatly...

单项选择题—Our vacation was Yes, I'ye never had ______.

They ______ visit us a lot but they don't now.A．mustB．n...

单项选择题They ______ visit us a lot but they don't now.

He is reading a novel but he ______ a textbook.A．ought ...

单项选择题He is reading a novel but he ______ a textbook.