—What’s matter?
—I have toothache.
| A．/; a | B．the; a |
| C．the; an | D．a; a |
—____ the workers are very tired, ____they keep on working.
— They are great. We must learn from them.
| A．Because; / | B．Though; / |
| C．Because; so | D．Though; but |
If Tony_____ to the corner this weekend, Bob will join him.
| A．has gone | B．are going | C．goes | D．went |
Her husband is a great cook. So she can enjoy _____ food every day.
| A．tasting | B．cooking | C．tasty | D．to cook |
—Would you mind opening the window?
—____. Look at the heavy haze (霾) outside.
| A．Yes, of course | B．Not at all |
| C．We'd better not | D．No problem |
It’s ____ useful book. And ____ book is popular with students.
| A．a; a | B．an; a | C．the; the | D．a; the |