Tom was about to close the window his attention was caught by a bird.
| A．when | B．if |
| C．and | D．till |
____________ great help; I could get rid of all the difficulty and succeeded.
| A．Offered | B．Having offered |
| C．Being supplied | D．Having supplied |
The reason__________ their failure you know is they didn't get fully prepared for the experiment.
| A．why.., that | B．that.., why | C．for.., that | D．why.., because |
--Why has he been staying at home these days?
--He ___________ since a month ago.
| A．has been out of work | B．was out of work |
| C．has lost his work | D．had left from his work |
The president of the country was well_________ of when he was in power.
| A．praised | B．fond | C．appreciated | D．thought |
The gas tank____________ twenty gallons of gas, but now it may____________ only three gallons.
| A．holds; contain | B．holds; be contained |
| C．is held; contain | D．is held; be contained |