—Why not paint the Golden Gate Bridge blue or other colors?—The bridge has always been painted "International Orange" ______ that color is easier to see in the heavy fog.
—We’ll have ________ holiday next month. Will you go home? —No. If I go home, I’ll have to take________ ride.
It’s _____ hard problem for the twins that ____ of them can work it out.
You ______ to the party if you’re so busy.
—_____I use your dictionary, Tom? —Of course, you _______
Simon improved his way of study. ________, he has made great progress.