_______cloning human embryos is not legal in many countries, some scientists are already pushing ahead with research in order to produce a cloned human baby.
| A．While | B．When | C．Since | D．if only |
. --- Did ________ get through the driving test?
--- No, ________. A few failed.
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. _____ you may have, you should gather your courage to face the challenge.
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. I thought of him as my best friend until he ______ to the boss.
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. --- I know this is the latest type but it is second ---hand.. ＄20---that’s my last offer.
--- Ok. It’s a(n)_______.
| A．business | B．trade | C．agreement | D．deal |
. ______we’ll be able to drive a car______ by electricity, solar energy in about ten years.
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