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 |
Apple and Microsoft _______ with each other for the world market to sell more PC with their own free software.
| A．compare | B．compete | C．fight | D．deal |
It is ________ tradition for people in this country to pay in ________ cash when buying things.
| A．the; 不填 | B．a; 不填 | C．不填; the | D．a; the |
You can tell him everything，as he is a man who you can _____ on.
| A．rely | B．attach | C．perform | D．affect |
Susan advised me not to buy the vase, but I bought it _____.
| A．anyhow | B．however | C．though | D．Totally |
The two top students in Mr. Green’s class competed _____ each other for the highest marks.
| A．to | B．for | C．in | D．Against |