＿＿＿＿＿ is our duty ＿＿＿＿＿ the environment.
A.This; protect B.It; to protect
C.This; protecting D.It; protect
＿＿＿＿＿ of our school is covered with trees and grass.
A. Third-one B. One-threeth
C. One-third D. One-thirds
His watch is 5 minutes ＿＿＿＿＿. He feels ＿＿＿＿＿ now.
A.slow; worry B.slow; worried
C.slowly; worry D.slowly; worried
He’s made great progress, ＿＿＿＿＿?
A.doesn’t he B.isn’t he
C.has he D. hasn’t he
Taiwan is ＿＿＿＿＿ the southeast of China.
A.in B.on C.At D.to
The plane will ＿＿＿＿＿ from Pudong Airport and land in Beijing.
A.take up B.take off C.take out D. take away
