I took mathematics and physics because I think that ________ very important for me to make further research in this field.
He has lived at for 30 years.
The book is of great value can be enjoyed form it until you have a deep understanding of it, however.
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.