Only after the woman had her own child ___ how difficult it was to be a mother.
| A．she realized | B．had she realized | C．she had realized | D．did she realize |
Only by ______ your attention _____ what you are learning can you learn it well.
| A．focus; on | B．focusing; on |
| C．paying; on | D．pay; on |
How proud she is! She has been ________ Beijing University.
| A．admitted to | B．agreed to |
| C．received by | D．addicted to |
I used to quarrel a lot with my parents, but now we ________ well.
| A．look out | B．stay up | C．carry on | D．get along |
---- She looks happy. She ________ have passed the exam.
---- I guess so. It’s not difficult after all.
| A．should | B．could | C．must | D．might |
Scientists have to work hard to keep ________ with modern discoveries and developments.
| A．company | B．track | C．pace | D．touch |