_________ 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
— As we know, keeping positive is beneficial to the process of our work and study.
— You can say that again. Struggle not to let negative ideas_______.
A. take over B. take off
C. take on D. take up
On the morning of October 12, 1492, Christopher Columbus and his crew came to the shores of the Caribbean islands, mistakenly believing they ________ in Southeast Asia.
A. arrived B. had arrived
C. has arrived D. would arrive
