Will you stay for some more days? —Sorry, I_____. My mother called to ask me to go back at once.

When did Hong Kong return to our motherland? — ____ 1997. [ ]

________ is this pen? — It’s white.

Lin Dan’s success_______ all the Chinese. We believe that he can do better in the 2016 Olympics.

How do you usually study for a test?－I study__________.[ ]