—Do you know the scientist Qian Xuesen?
—Yes, he’s a great ______ in the modern science field.

(单选题)She managed to save ______ she could out of her wages to hel (单选题)This is not a good flower for your bedroom decoration ______ (单选题)The pupils could play over the whole Beethoven’s Fifth _____ (单选题)John has no alternative but ______ his parents for help. (单选题)Although punctual herself, Professor Barbara was quite used (单选题)The course normally attracts 20 students per year, ______ up (单选题)If the air were as dangerous as some people think, a lot mor (单选题)The old man scarcely cared for anything, ______? (单选题)With the elevation of people’s standard of living, cosmetics (单选题)The railways were once privately owned but are now under ___