--- What do you think of my answer to the questions?
--- Sorry. I _____ about something else.
| A．thought | B．had thought |
| C．am thinking | D．was thinking |
— Our classroom is clean every day.
—___________.It’s our duty to keep it clean and tidy.
A. So we are
B. So is it
C. So it is
I have _____this book for two weeks. I have to return it now.
A. borrowed B. kept C. had
Now most families in China have only one child _____ the one-child policy.
A. because of
B. instead of
C. in order to
Mrs. Smith _____ in Beijing since 2008.
A. livedB. has livedC. lives
— Where are Maria and Kangkang?
—They _____ England.
A. have been to
B. have been in
C. have gone to