nd that complex problems, especiallythose _____ abstract thinking, were best for picking out bright and dullstudents.

My friend and I joined a program ______ Green China.

The 16th Asian Games in Guangzhou from November 12 to November 27，2010

When David is in a bad mood, he likes wearing orange to _______.

nine years ago, when I came to China for the first time ____ I began to learn Chinese.