. Mathematics ______ the language of science.
| A．is | B．has been | C．are | D．have been |
35. Do you know who ________ using water in this way?
| A．benefits in | B．benefits from | C．benefits | D．Benefit |
34 He tried his best to solve the problem, _______ difficult it was.
| A．however | B．no matter | C．whatever | D．Although |
33. The oil in the cooker ___ heavy smoke, which made us in tears and difficult to open our eyes .
| A．gave in | B．gave away | C．gave up | D．gave off |
32. ---I can’t see words on the blackboard clearly .
---Why, your eyes need _____ .Perhaps you need ______ glasses .
| A．to examine; wear | B．to examine; to wear |
| C．to be examined; to wear | D．examining ; wearing |
31. Attention must be paid to ______ science and technology..
| A．develop | B．developing | C．development | D．Developed |