Rather than carry out the project by itself, the company planned to _________ with other potential cooperators.
| A．catch up | B．come up |
| C．keep up | D．team up |
________ where we can stay for a week.
| A．Next is another hotel to it | B．Next to it another hotel is |
| C．Next to it is another hotel | D．It is next to another hotel is |
Carbon dioxide(CO2)_______ from burning fuels is the most common of the so-called greenhouse gases.
| A．producing | B．having been produced |
| C．to be produced | D．produced |
We must apply what we have learned to our daily work because in no case_____ from practice.
| A．should theory separate | B．theory should be separated |
| C．theory should separate | D．should theory be separated |
Mrs. White found her husband surrounded by letters and papers and_______ very worried.
| A．look | B．looked | C．looking | D．to look |
----What are you busy with?
---- The conference_______ in our city next week.
| A．held | B．to be held | C．be holding | D．will be held |