19.There is no doubt ________ the earth is becoming warmer and that it is human activity ________ has caused this global warming rather than a random but natural phenomenon.( )
| A. | whether; whether | B. | whether; that | ||
| C. | that; that | D. | that,whether |
18.Can you think of a situation ______ you once felt ________?( )
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| A. | where,embarrassed | B. | which; embarrassing | ||
| C. | when; embarrassed | D. | that; embarrassing |