on the top of the mountain is an ancient tower dating back to hundreds of years ago .
| A．To stand | B．Having stood | C．Standing | D．Stand |
------ The authors of computer viruses are geniuses.
------ I agree. They can apply their wisdom to other net technology ________ human beings can benefit.
| A．in which | B．through which | C．on which | D．from which |
I’m lucky _______ the thing I enjoy doing more is ________ I’ve ended up doing.
| A．what; what | B．what; that | C．that; what | D．that; that |
The construction of the two new railway lines ________ by now.
| A．have been completed | B．has been completed |
| C．has completed | D．have completed |
These teenagers don’t know much of the world yet; that’s why they are so easily _________ .
| A．taken in | B．taken on | C．taken up | D．taken over |
Everyone Obama meets seems to be _________ with his pat-on-the-back signature.
| A．awarded | B．rewarded | C．provided | D．familiar |