Without proper lessons, you could _______ a lot of bad habits when playing the piano.
| A．give up | B．catch up | C．pick up | D．keep up |
His sacrifices for the country were never officially _____, which made all of us feel discouraged．
| A．acknowledged | B．appealed | C．associated | D．approved |
What a pity! I missed meeting my friend at the airport because my car was _____ in the traffic jam．
| A．broken up | B．held up | C．kept back | D．kept up |
--- I'd have made a phone call to you, ___________ your telephone number．
--- That’s all right．What was up then?
| A．if I know | B．had I forgotten |
| C．if I hadn’t remembered | D．but I forgot |
The cousins are alike in age, but _____ they are as different as day and night．
| A．anyhow | B．besides | C．otherwise | D．moreover |
Is it a wonder that _____ little cells can store _____ much energy?
| A．such, so | B．so, much | C．so, so | D．such, such |