While he was investigating ways to improve the telescope Newton made _______discovery which completely changed ____ man’s understanding of color.
| A．a ,/ | B．a ,the | C．/, the | D．the ,a |
“I’ve told everyone about it.” “Oh, I’d rather you _____.”
| A．don’t | B．hadn’t |
| C．couldn’t | D．wouldn’t |
If I hadn’t been lucky enough to meet you. I really _____ what I would have done.
| A．don’t know | B．hadn’t known |
| C．wasn’t knowing | D．wouldn’t know |
“I still haven’t thanked Aunt Lucy for her present.” “It’s time you _____.”
| A．do | B．did |
| C．had | D．would |
_____ smoking, he would not have got cancer in the lung.
| A．Was he given up | B．Had he given up |
| C．Did he give | D．If he gave up |
I advised that he ______ to the hospital at once, but he insisted that he ______ quite well then.
| A．was sent; felt | B．be sent; was feeling |
| C．he sent; feel | D．should be sent; should feel |