He claims to _____ a round black creature moving quickly through the water.
| A．see | B．have seen |
| C．be seen | D．be seeing |
—If you like I can do some shopping for you.
—That’s a very kind __________.
| A．offer | B．service | C．point | D．suggestions |
—How often do you eat out?
________, but usually once a week.
| A．Have no idea | B．It depends |
| C．As uaual | D．Generally speaking |
There are certain _______when you have to interrupt people who are in the middle of doing something.
| A．chances | B．situations | C．occasions | D．opportunities |
It’s bad ____ for a man to smoke in the public places where smoking is not allowed.
| A．behavior | B．action | C．manner | D．movement |
Yao Ming as well as his teammates ______ hard to win honor for China these years.
| A．work | B．are working | C．has been working | D．works |