.--How much did you ________for the pen? --Five yuan.
–Why do you choose to work in an international travel agency?-- Well, you know, English is my _______. So it is my best choice.
She will tell us why she feels so strongly that each of us has a role _____ in making the earth a better place to live in.
I thought her nice and honest _________ I met her.
You had better _____ some time every day for sports so that you can keep yourself energetic.
---Obama took oath (宣誓)of office in the White House。---When was _____?---____was on January 23,2013.