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
I don’t doubt _____ he is a brilliant scientist, but can he teach?
| A．whether | B．if | C．that | D．what |
Criticism and self-criticism is necessary _____ it helps us to correct our mistakes.
| A．by that | B．at that | C．on that | D．in that |
_____ or not we had a baby, we couldn’t survive only on my salary.
| A．As | B．Even | C．However | D．Whether |
_____ you are familiar with the author’s ideas, try reading all the sections as quickly as you possibly can.
| A．Now that | B．Ever since | C．So that | D．As long as |
_____ he works hard, I don’t mind when he finishes the experiment.
| A．As soon as | B．As well as | C．So far as | D．So long as |