城市居民委员会是我国现行政治体制中 [ ]
A．基层 * * 组织
B．基层自治组织
C．基层社会团体
D．基层经济组织
答案：B
We had no time_________, but we had a great time _________the model plane together．
A．to chat；making
B．to chat；to make
C．chatting：making
D．chatting；to make
________ you have the drug habit, you'll find it hard to get rid of. [ ]
A. Unless
B. Once
C. Though
D. Before
