At a rough estimate, Nigeria is ____ Great Britain.
| A．twice big as | B．as twice big as | C．three times the size as | D．three times the size of |
I’m afraid there might have been 1000 audience in the concert last night, _____?
| A．am not I | B．aren’t I |
| C．mightn’t there | D．weren’t there |
_________ in the adult ceremony, the senior students feel they are shouldering heavier responsibilities now.
| A．Swear | B．Sworn |
| C．Having sworn | D．To have sworn |
Tu Youyou won Nobel Prize in Medicine for her discoveries that helped doctors fight malaria and _______ caused by roundworm parasites.
| A．injections | B．infections |
| C．prescriptions | D．presentations |
In the face of various economic uncertainties at home and abroad, the government has carried out ________ reforms to boost the economy.
| A．bureaucratic | B．systematic | C．arbitrary | D．ambiguous |
—Dear me! It’s you, Bob! I ______ to recognize you at first sight!
—Nor did I! Time has changed us a lot!
| A．fail | B．failed |
| C．have failed | D．had failed |