根据下面各题括号内的汉语，结合句子的要求写出恰当形式的英语单词。

1. The girl learns to play the violin on every _____ (星期二) evening.

2. On holidays, tourists like to go to Dinghu Mountain because of the _____ (新鲜的) air.

3. My sister _____ (花费) more than four thousand yuan for her iPhone 4.

4. The two _____ (熊猫) "Tuantuan" and "Yuanyuan" were warmly welcomed when they arrived in Taiwan.

5. In modern_____ (社会), science technology has developed rapidly.