30. Why are you so anxious? It isn’t your problem______ .
| A．on purpose | B．in all | C．on time | D．after all |
At the beginning of class, the noise of desks __________ could be heard outside the classroom.
| A．opened and closed | B．to be opened and closed |
| C．being opened and closed | D．to open and close |
I smell something __________ in the kitchen. Can I call you back in a minute?
| A．burning | B．burnt |
| C．being burnt | D．to be burnt |
As the light turned green, I stood for a moment, not ___, and asked myself what I was going to do.
| A．moved | B．moving |
| C．to move | D．being moved |
—Come on, please give me some ideas about the project.
—Sorry. With so much work __________ my mind, I almost break down.
| A．filled | B．filling |
| C．to fill | D．being filled |
— Robert is indeed a wise man.
— Oh, yes. How often I have regretted __________ his advice!
| A．to take | B．taking |
| C．not to take | D．not taking |