If someone has an accident and can no longer walk, scientists might be able to use stem cells to ___ the damaged cells and allow that person to walk again.
| A．rescue | B．remove | C．reserve | D．replace |
Word __________ quickly that the former Libyan leader Al-Gaddafi was killed in his hometown.
| A．got around | B．got down |
| C．got away | D．got through |
—We're organizing a party next Saturday, and I'd like you to come.
— __________! I have another one that day. Thank you just the same.
| A．Good luck | B．What a pity |
| C．Never do it again | D．Well done |
—What do you think makes him so sad?
— __________ the exam.
| A．He failed | B．He failing |
| C．His failing | D．To have failed |
Ladies and gentlemen, please fasten your seat belts. The plane __________.
| A．takes off | B．is taking off |
| C．has taken off | D．took off |
When delivering the speech, you can __________ your note if necessary.
| A．refer to | B．come across |
| C．look after | D．watch out |