The question that puzzled us is _____ we can get rid of the air pollution in the area.
| A．that how | B．how is it that | C．what is it | D．how it is that |
The project ______ last month but unfortunately it had to be prolonged because of the financial problem.
| A．needn’t have been finished |
| B．shouldn’t have finished |
| C．could have been finished |
| D．must have finished |
I think this software is of little use to your work. It is really a ________ of money.
| A．lack | B．load |
C．question | D．waste |
It’s said that this kind of plant only gives off this strange perfume on ________ conditions which the scientists are trying to figure out now.
| A．outstanding | B．certain |
C．obvious | D．ordinary |
As we know, success often comes after ______ failure; so don’t be so upset about _______ failure of this matter.
| A．a; a | B．不填; the |
C．a; the | D．不填; a |
It was in the street _______ I met one of my friends yesterday.
| A．how | B．that |
| C．which | D．when |