Scientists generally agree that Earth’s climate will warm up over the next 50 to 100 years _________ it has warmed in the 20 000 years since Ice A
ge．
| A．as long as | B．as much as | C．as soon as | D．as well as |
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Had I mastered the statistic technique, a large amount of time and, energy.
| A．was avid | B．had been saved | C．will be save d |
D．would have been saved |
It is meetingside effect the new medicine will bring about, although the experts have tried it on about 2,000 patients.
| A．that | B．what | C．whether | D．which |
Now methods need to beto use the existing water resources, for example, turning sea water into fresh water.
| A．developed | B．assumed | C．abandoned | D．purchased |
More and more farmers arrive in our city for the money-making jobs the before leaving that Houston.
| A．were promised | B．have promised | C．promise | D．have been promised |
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