-What's up? You look worried.
Well,I_____on the problem for 5 hours but I haven't got a single clue.
| A．have worked | B．worked |
| C．will work | D．have been working |
It snowed heavily for three days and they were separated from the outside world.
| A．in the end | B．on end | C．by the end | D．at the end |
everyone can hear the speaker there is no of turning up the radio.
| A．Now that; point | B．Even if; point | C．Now that; need | D．Even if; need |
If it was not an accident, he must have done it .
| A．on purpose | B．in common | C．on occasion | D．in time |
Because prices of food and clothing and almost everything else in that country have steadily gone up, the buying of the dollar has gone down.
| A．energy | B．force | C．power | D．strength |
——What’ s the matter?
—— The shoes don’ t fit properly.They＿＿＿＿my feet.
| A．are hurting | B．will hurt |
| C．have hurt | D．are hurt |