Although he knew little about the large amount of work done in the field, he succeeded ________ other more well - informed experimenters failed.
| A．which | B．that | C．what | D．where |
Come and see me whenever ________.
| A．you are convenient | B．you will be convenient |
| C．it is convenient to you | D．it will be convenient to you |
--The plane is due to take off at 7∶50 from the airport.
--________ we fail to arrive there in time?
| A．What if | B．As if | C．Even if | D．Only if |
--They ________ out the problem, but failed.
--What a shame ! I never thought it was going to happen like that.
| A．managed to work | B．managed working |
| C．sought working | D．sought to work |
--Let’s go there by taxi.
--It’s not far from here, I prefer ________.
| A．walking to take a taxi | B．to walk rather than take a taxi |
| C．walk to taking the taxi | D．to walk rather than to take a taxi |
They ________ the train until it disappeared in the distance.
| A．saw | B．watched | C．noticed | D．observed |