Never in my life ____ such a thing.
| A．I have heard or have seen | B．have I heard or seen |
| C．I have heard or seen | D．did I hear or see |
29. On March 12, the students were planting trees ____ the classroom.
| A．in the back of | B．at the back of | C．to the back of | D．on the back of |
30. Once Jerry is back of you, there will be nothing halfway. The underlined part probably means _____.
| A．hate | B．support | C．beat | D．Face |
31. Don't throw out the _____ with the bath water.(prov.)
| A．boy | B．girl | C．baby | D．Child |
32. According to the regulation, all _____ should be examined before boarding a plane.
| A．suitcase | B．baggages | C．a luggage | D．the baggage |
33. Yan'an used to be a revolutionary _____ for the Red Army.
| A．base A | B．basis | C．foundation | D．Ground |