I had no idea ____ is better, so I took ____ of them.
| A．what;both | B．what;none | C．which;both | D．which;none |
31. I like getting up very early in summer. The morning air is so good ______.
| A．to be breathed | B．to breath | C．breathing | D．being breathed |
30. Why are you so anxious? It isn’t your problem______ .
| A．on purpose | B．in all | C．on time | D．after all |
29. You have no idea how she finished the relay race ______ her foot wounded so much.
| A．for | B．with | C．when | D．while |
28. Let’s ______my scientific knowledge and your business skills and start a company.
| A．connect | B．relate | C．combine | D．put |
27. He gave in to ______and opened the letter addressed to his sister.
| A．curiosity | B．feeling | C．worry | D．hope |