—How unhappy your roommate looks!—Yes, but he's not willing to tell me what it is _______ is troubling him.
Guangzhou is making preparations for the 16th Asian Games ________ in November, 2010.
______ can be enjoyed from a low-carbon lifestyle until you have a deep understanding of it.
--It looks rain. Shah I take an umbrella for you? --________.
Jack had ______ feeling of excitement when hearing his article published in ________ school magazine.
High house prices can be brought under control ________ the government takes some necessary measures.