---What are________ teachers doing?---They are having a meeting.
| A．this | B．that | C．those | D．they |
The scientist_______ everyone ______ our environment .
| A．urge; protect | B．urged; to protect |
| C．urges; protect | D．urged; protect |
Tim is weak in math, so he is trying _________ up with other students now.
| A．to catch | B．catch | C．catching | D．caught |
Every student in our calls is looking forward to ______a good future.
| A．have | B．had | C．has | D．having |
I must return the two books to the library. I _____ them for 20 days.
| A．borrowed | B．kept | C．have kept | D．have borrowed |
I think these sunglasses make me look ______. What do you think?
| A．mysterious | B．relax | C．hungry | D．safe |