He tried his best to solve the problem, _______ difficult it was.
| A．however | B．no matter | C．whatever | D．although |
33.It is no _____arguing with Bill because he will never change his mind.
| A．use | B．help | C．time | D．way |
32.What kind of mistakes do you want to avoid ____full marks in your test?
| A．to get | B．get | C．getting | D．will get |
31. _____his being late again,he lost his job and had to stay at home.
| A．Owe to | B．As result of | C．In case of | D．Because |
30.We don’t allow____here,but we can allow you ____in the next room.
| A．smoking,smoke | B．smoke,smoking | C．smoking,to smoke | D．smoke,to smoke |
29.They look forward____a chance to receive further education.
| A．of getting | B．in getting | C．to get | D．to getting |