-----“She's not a dancing teacher, is she?”
------ “_____.”
| A．Yes, and she isn't | B．Yes, but she was |
| C．No, but she isn't | D．No, but she was |
. The government doesn’t know how to deal with the dangerous situation all the public are aware of at present.
| A．where | B．which | C．when | D．who |
. Don't bother Tom, he is with the experiment on water molecules in the lab.
| A．focused | B．fixed | C．occupied | D．concentrated |
It’s____ comfort to know that so many people are donating money and food to the people in need.
| A．/, the | B．a, the | C．a, / | D．/, a |
_________ the project in time, the workers were working at weekends.
| A．Completing | B．Having completed | C．To have completed | D．To complete |
. _________ many times, he finally understood it.
| A．Told | B．Telling | C．Having told | D．Having been told |