Evidence has been found through years of study_____children's early sleeping problem is likely to continue when they grow up.
| A．why | B．how | C．whether | D．that |
No matter how fast we worked, ____.
| A．we couldn’t catch up with them | B．and we couldn’t catch up with them |
| C．so we couldn’t catch up with them | D．but we couldn’t catch up with them |
The teacher found ____ difficult to decide ____ he would take with him to attend the conference.
| A．it; whom | B．himself; who | C．this; whom | D．that; who |
Living things are dying out quickly. Let’s ask ____ destroying them in the past years.
| A．what part people have been playing |
| B．people have played in |
| C．what part people have played in |
| D．people have been playing what part |
The man who was being followed stopped from time to time ____ he wanted to tie his shoelaces.
| A．as if | B．like | C．what | D．as |
____ he was fired by the company is ____ he didn’t work hard.
| A．What; because | B．Why; because | C．Why; that | D．That; because |