26.Younger adults who get either little sleep or a lot of it ________ see a greater expansion in their waistlines over time.
A. may B. must D. need D. Shall
30．Frank’s marriage to the billionaire’s daughter got him through his hardest time, ________ years later he wondered what he could have done differently 。
| A．therefore | B．and | C．however | D．but |
North Korea has always sought for a direct talk with the US, without China ________.
| A．involving | B．to involve | C．involved | D．be involved |
Her piano skills were so good ________ a ten-year-old that the judges of the contest simply couldn’t believe it.
| A．for | B．as | C．to | D．about |
The young tribal man helped Mrs．Davidson find her way back, in return for________ medical equipment was offered to him by the latter.
| A．that | B．whose | C．which | D．whom |
The difficulty solving such a problem ten years ago was twice greater than ________ is today.
| A．it | B．that | C．as | D．what |