— Has Grandma arrived?
— Not yet. She will give us a call as soon as she__________.
A.lands B.landed C.will land D.was landing
The Adventures of Tom Sawyer __________ by Mark Twain.
A.writes B.wrote C.will be written D.was written
Since 2008, China__________ a powerful high-speed railway network.
A.develop B.developed C.has developed D.will develop
Supercomputers are thousands of times__________ than ordinary computers.
A.fast B.faster C.fastest D.the fastest
I did well in the sports meeting this term__________ I trained hard.
A.because B.so C.when D.if
— Linda, __________ you take care of your little sister this afternoon?
— Sure, Mom!
A.must B.need C.can D.should
