— Hi, Jessica! I________you were in Nanjing. People told me you were in Shanghai.
— Well, I came back just one hour ago.
A.don’t know B.didn’t know C.haven’t known D.won’t know
Which of the following sentences is written in informal language?
A.Marie Curie was famous for winning the Nobel Prize.
B.The park lies 15 kilometers away from the city center.
C.Mr. Smith wants to know whether he is famous or not.
D.I won’t tell you the secret because you have a big mouth.
—I’ve heard scientists have drawn a map of the complete ________ of the moon. That’s amazing!
—Exactly. It took 10 years to make it.
A.sense B.situation C.surface D.standard
—People should still keep a social distance these days.
—Yes. A large number of masks ________ in the following months.
A.needed B.are needed C.were needed D.will be needed
Cao Yuan, a young Chinese scientist, has ________ the world with his papers published in Nature, a world-famous science magazine.
A.supposed B.surprised C.succeeded D.suggested
— Do you know a new shopping mall opened in our town yesterday?
— Yes. Why don’t we pay a visit________we have time?
A.until B.since C.unless D.though
