It's an eitheror situation —we can buy a new car this year or we can go on holiday but we can't do ________.
| A．others | B．either |
| C．another | D．both |
What if we meet with a situation _______ none of us are able to deal with?
| A．where | B．in which | C．what | D．that |
His lack of professional knowledge _______for the failure of the experiment.
| A．accounted | B．explained | C．counted | D．contributed |
Tom was about to close the window his attention was caught by a bird.
| A．when | B．if | C．and | D．till |
—Do you have any idea why Mark is leaving?
—No. In fact，everyone is _________about it.
| A．doubtful | B．curious | C．enthusiastic | D．annoyed |
—Mary looks down today. What is up?
—Well，________happened between Mary and me is none of your business.
| A．wherever | B．whoever | C．whatever | D．no matter what |