Tom is good at maths, so I think he is the student ______can help you to work out this problem.
19. Is this the very factory ____ he visited last month?
The first thing ____ you should do is to learn all the new words by heart.
The students are talking about the strange people and stories ____ they met in the adventure.
It is not I but Mr. Green who ____ in charge of the company.
____ much advice I gave him, he did exactly what he wanted to.