28. Dr. Frank failed many times but he finally _____ to find a successful way to solve the problem.
| A．broke off | B．broke up | C．broke down | D．broke through |
—Are you still working in that company, Mary?
—No, it is ten months ____ I worked there.
| A．after | B．that | C．before | D．since |
around the lab, we were taken to see the library.
| A．Being shown | B．Showing | C．Having been shown | D．To show |
They will send kids to collegeit takes, even if that means a huge amount of debt.
| A．whoever | B．however | C．whatever | D．whichever |
Finding a job in such a big company has always beenhis wildest dreams.
| A．under | B．over | C．above | D．beyond |
—Hey, you haven't been acting like yourself. Everything is OK?
—.
| A．Sure, it is | B．I'm fine, thanks | C．That's good | D．It's a pleasure |