He has worked __________ the maths problem for nearly an hour but he simply can't work it __________.
| A．on；at |
| B．on；out |
| C．at；up |
| D．for；out |
This problem is ______ his ability and 1 don't think he can solve it.
| A．to | B．in | C．beyond | D．under |
I was almost asleep last night when I suddenly heard someone ______ at the door.
| A．be knocking | B．knocking | C．to knock | D．having knocked |
It wasn't such a good job ______ she had read about in the advertisement.
| A．like | B．which | C．as | D．what |
She didn't go to the party last night, ______ she had to finish her term paper.
| A．if | B．though | C．till | D．because |
It's my great honor ______ to give a speech at the opening ceremony.
| A．to invite | B．inviting | C．having invited | D．to be invited |