There’s no doubt ______ the famous professor will come to give us a lecture.
| A．if | B．that | C．what | D．whether |
For a long time, they walked without saying _________ word. Jim was the first to break ________ silence.
| A．the; a | B．a; the | C．a; 不填 | D．the; 不填 |
There is no doubt our educational system leaves something to be desired．
| A．what | B．whether | C．if | D．that |
Before writing your answer, please give careful __ to the question．
| A．consideration | B．translation | C．examination | D．expression |
Helping others is a habit,you can learn even at an early age
| A．it | B．which | C．what | D．that |
—How much do I owe you for lunch?
—.It ' s nothing．
| A．You're welcome | B．Not at all | C．Forget it | D．That's right |