The window was broken. Try to ________ whohas broken it.

Sam_______ some knowledge of the computer just bywatching others working on it..

We are designing an experiment to find out whether glass _____ more easily when it is cold[ ]

The boy standing Tina is too tall ,so she can’t see the picture on the wall．

It’s a long time _____ I saw you last.—Yes, and what a pity it is now that it will be a long time _______ we see each other again