We should do what we can _____ the homeless people.

Itbe difficult to get a train ticket during traditional Chinese Spring Festival this year because there are many ticket windows.

Mary is always pleased __________ at the party.[ ]

31．With the cell phone available, I can do whatever I want to do and still______in touch with my parents and friends

nute I saw my former classmate, his name simply ________me, and I stood there not knowing how to address him