Be careful when you deal with this chemical, as it will explode when ______ to sunlight.
| A．exposed | B．to expose | C．exposing | D．being exposed |
Bush, before Barack Obama, _______ Brown a similar gift, a leather bomber jacket．
| A．gave | B．have given | C．would give | D．had given |
The students _____ busily when Miss Brown went to get a book she ____ in the office．
| A．had written; left | B．were writing; has left |
| C．had written; had left | D．were writing; had left |
With the world changing fast, we have something new ______with all by ourselves every day．
| A．deal | B．dealt | C．to deal | D．dealing |
The discussion was held in a lively______ with members talking freely to each other．
| A．atmosphere | B．weather |
| C．situation | D．phenomenon |
Michael’s new house is like a huge palace, ______with his old one．
| A．comparing | B．compares |
| C．to compare | D．compared |