Smoking too much may ______ lung cancer and cause other diseases.
| A．devote to | B．attend to |
| C．contribute to | D．come to |
The police tried ________________ to break up the protest crowds.
| A．in a vain | B．in vain | C．in the vain | D．for vain |
When we climbed up to the top of the mountain, we were all___________.
| A．out of the breath | B．short of the breath |
| C．out of breath | D．short of breaths |
. All the students were____ when they heard the_____ news.
| A．excited…excited | B．excited… exciting |
| C．exciting… exciting | D．exciting… excited |
Last night he worked until late. _____, he had to walk home in the dark.
| A．In other words | B．In return | C．In my view | D．As a result |
_______ with the size of the whole earth, the biggest ocean does not seem big at all.
| A．Compare | B．When comparing | C．Comparing | D．When compared |