For some parents, the Internet can seem like a jungle, ______ danger for their children．
| A．filled with | B．filling with |
| C．to be filled with | D．having been filled with |
Mary wrote books to earn money while John gained his wealth _________ selling Mary’s works.
| A．on | B．by | C．in | D．through |
I hated it when people don’t ___________ their promises.
| A．carry out | B．look out | C．run out | D．find out |
________ hard he tried, he could not change his wife’s mind.
| A．However | B．Whatever | C．As | D．No matter what |
------I don’t know why he has made such a silly mistake in the exam.
------ He ____________ it before he handed in the paper.
| A．may have checked | B．might check |
| C．must have checked | D．should have checked |
Read the passage a second time, ___________ the meaning won’t become clearer to you.
| A．and | B．so | C．or | D．but |