7．We just had to show our________(护照)and they let us get on the boat.

6．At least the Italians________(敲诈)you off with a smile.

5．And everywhere he goes，he sends himself a________(明信片)．

4．We sailed into the c________site of the dam.

3．Build the Three Gorges Dam，E_______the Yangtze River.

2．On a distant mountain was a sign in 20­foot_______(汉字)．

1．The gorge n________ to 350 feet as the river rushes through the two­mile­high mountain.

6、 在2008年春运期间，我国南方出现大范围冰雪灾害，导致某地电路断电.该地供电局组织电工进行抢修.供电局距离抢修工地15千米.抢修车装载着所需材料先从供电局出发，15分钟后，电工乘吉昔车从同一地点出发，结果他们同时到达抢修工地．已知吉普车速度是抢修车速度的1.5倍，求这两种车的速度。

5、在“汶川地震”捐款活动中，某同学对甲、乙两班捐款情况进行了统计：甲班捐款人数比乙班捐款人数多3人，甲班共捐款2400元，乙班共捐款1800元，乙班平均每人捐款的钱数是甲班平均每人捐款钱数的倍．求甲、乙两班各有多少人捐款？

4、关于x的方程会产生增根，求k的值