Mary must keep her mind on her medical studies now, so it would be years ______ she could think about marriage.
| A．before | B．when | C．since | D．until |
I would rather buy a house in the suburb than ____ in the city.
| A．it | B．one | C．this | D．that |
I _____ on a sofa because my grandparents have come for the weekend.
| A．slept | B．was sleeping | C．have slept | D．am sleeping |
____ you want to remember its usage, you’d better make a sentence with the new word.
| A．Unless | B．While | C．Now that | D．Even if |
Of the two, I would prefer ____ camera, which is very easy for me to carry.
| A．a small | B．a smaller | C．the small | D．the smaller |
----Did you happen to see ____ black and ____ white cat?
----Is she missing? I told you to take care of her.
| A．the; the | B．the; / | C．a; / | D．a; the |