Not until they left school ______ how much their teachers loved them and helped them.
There's no way of knowing why one man makes an important discovery________another man,also intelligent,fails.
It was a real race________time to get the project done.Luckily,we made it.
A serious study of physics is impossible________some knowledge of mathematics.
I have an appointment ________ Dr.Smith, but I need to change it.
________everyone here,I wish you a pleasant journey back to your country.