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.