--I’m exhausted. I ______ on a design day and night.--You’d better have several days off after finishing it. Otherwise you might break down.
The man showed us so heavy a stone _______ no man can lift.
______ he met with the difficulty did he realize the importance of our help.
There is not one of us wishes to help you . We are doing our best .
—Alice, you feed the bird today; ? —But I fed it yesterday.
Our school is no longer ______ is was 10 years ago, _______ it was not well equipped.