They will never succeed, _____ hard they try.
| A．because | B．however | C．when | D．since |
— I am sorry to hear that your mother is ill in hospital.
— ____.
| A．That’s all right |
| B．You don’t have to be so sorry |
| C．It is nothing |
| D．It’s very kind of you |
Generally speaking, in the United States ____ 15-percent tip is normal for ____ most restaurants.
| A．a; / | B．an; the | C．/; a | D．/; the |
You say you don’t believe in marriage,but I bet you sing a different song when you finally ______ with this beautiful girl.
| A．fall in love | B．get along | C．are connected | D．are pleased |
Young people usually ______ sports heroes,like Michael Jordan and Tiger Woods,who are really amazing.
| A．live up to | B．go up to | C．look up to | D．play up to |
The comments which he made ______ marketing bothered his boss greatly.
| A．being concerned | B．concerned | C．be concerned | D．concerning |