We can hardly believe such a young boy_______ travel around the world all by himself.
A. may B. need
C. should D. must
President Xi Jinping demanded the environmental problems _______paid special attention to.
A. referred to be B. referred to being
C. refer to being D. refer to be
--- Haven’t seen you for ages! Where have you been ?
--- I went to Ningxia and _______ there for one year, teaching as a volunteer.
A. have stayed B. stayed
C. had stayed D. am staying
It was only after we had watched the film "Amazing China"_______ we realized what amazing achievements China has made in the past five years．
A. when B. that
C. which D. what
_______ the global economy is showing signs of recovery, many developing countries are still suffering.
A. While B. Where
C. How D. As
When we got to the railway station，the express hadn't started yet，so we _______．
A. needn't hurry B. didn't need hurry
C. needn't to hurry D. needn't have hurried
