It is pretty well understood controls the flow of carbon dioxide in and out the atmosphere today.
| A．that |
| B．when |
| C．what |
| D．how |
He didn't make_________clear when and where themeeting would be held.
| A．this | B．that | C．it | D．these |
I've worked with children before, so I know what_________in my new job.
| A．expected | B．to expect | C．to be expecting | D．expects |
So hard was the woman's life, but to her _________，her only son was admitted to a top university last year.
| A．surprise |
| B．relief |
| C．astonishment |
| D．disappointment |
_________，she is the sort of woman to spread sunshine to people through her smile.
| A．Shy and cautious |
| B．Sensitive and thoughtful |
| C．Honest and confident |
| D．Lighthearted and optimistic |
The policemen set out _________ the streets for the missing girl.
| A．searching for | B．to search | C．to search for | D．to search in |