What puzzles me most is why so many students bury themselves in piles of maths exercises _________they should spare some time to reflect on their previous mistakes.
A. once B. unless
C. when D. though
_______ to a task calls for perseverance and concentration, if you wish for the final success.
A. Committed B. Committing
C. Being committed D. To be committed
— Have you seen the cell phone I left here just now?
— No, sir. I _______ my English composition.
A. was polishing B. had polished
C. would polish D. have polished
Huawei is a global leader in telecoms with a great range of smart products to offer, many of __________exported abroad.
A. them B. which
C. it D. whom
house property tax come into effect, China might witness a fall in house prices.
A. Would B. Should
C. Could D. Might
I don't mind playing against a beginner，like myself，but I'm not going to _____ someone who has been playing chess for years．.
A. take up B. take on
C. take off D. take down
