It was not until the beginning of the twentieth century________to explore space.
| A．did man begin | B．when man began |
| C．that man began | D．then man began |
________ was the idea _______ the wife thought of
| A．What...that | B．That...what | C．How...why | D．Why...how |
________ we go swimming every day ________ us a lot of good.
| A．If...do | B．That...do | C．If...does | D．That...does |
My parents used ________ they had to get a new car for me.
| A．which | B．that | C．what | D．all what |
The city is no longer ________.
| A．what it is | B．that it used to be | C．which it was | D．what it used to be |
The little boy ate ________ his mother gave him.
| A．that | B．which | C．whatever | D．no matter what |