The two Chinese scientists have made a wonderful discovery, which marks a major _______ in the basic research in the field.
One of the sides of the board should be painted yellow, and .
---You don’t often see them, do you? ---No, I see of them.
He is clever and hard-working, so he has reason to succeed in the exam.
It’s , as I trust you so much.
. One of the students hasn’t prepared lessons very well.