A professor said the rise of the BRICS countries(金砖国家) is a/an _______ of the end of the world in the control of the USA.A. barrier B. process C. aspect D. symptom
We were about to climb up to the top of the mountain ________ it began to rain heavily.
—How do you find my idea? —_______.
Don’t you think that______________ is no use promising without doing?
Is this the girl______ whom I can turn for help? Is she good at this subject?
_______ our food running out, we had to walk to a village for help.