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 |
Earth is a rocky planet_____ liquid water, which is necessary for life, can exist.
| A．as | B．which | C．where | D．when |
.Having retired from business, he now_____ himself with the welfare of disabled and lives a meaningful life.
| A．associates | B．occupies | C．charges | D．rewards |
._____all the exercise every day, I’m still putting_____ some weight.
| A．Though; out | B．Despite; on | C．In spite; up | D．For; on |
The archaeologists all find_____ to prepare for the worst conditions they might meet during the restoration.
| A．worthy | B．it worthwhile | C．it worth | D．worthy it |
.Such an effort_____ the severe snow disaster didn’t prevent the whole nation from celebrating the traditional Chinese New Year happily.
| A．as the Chinese government has made |
| B．has the Chinese government made that |
| C．the Chinese government has made that |
| D．has the Chinese government made as |