Thank you for sending us ____ fresh vegetables of many kinds. You have done us ____ great service.
| A．不填；a | B．the；a | C．不填；不填 | D．the；不填 |
32. In the end I lost my ______ and shouted at her.
| A．character | B．manner | C．benefit | D．Patience |
31. Lewis was much admired ______ his work on the advanced medical research.
| A．on | B．in | C．for | D．With |
30. The pilot, whether ______ or design, made the plane do a sharp turn.
| A．by accident | B．at times | C．suddenly | D．all at once |
29. If you ______ go, at least wait until the rain stops.
| A．can | B．must | C．should | D．Would |
28. The reason for his success is ______ he worked very hard.
| A．why | B．that | C．whether | D．How |