We firmly believe that ______ the new examination system comes into existence, completely new situations will arise.
—Why do you choose to work in an international travel agency?—Well,you know,English is my ________,so it is my best choice.
The idea for the new plan came to his mind,________ to his experiment in the lab.
Your understanding on the theory is________satisfactory. You must read more after class.
Not until they left school________ how much their teachers loved them and helped them.
I thought Peter would have helped you.________is a great pity that he should be so selfish.