—What color is the pencil box?—It’s _______ black.
Many more trees should ____ this year.
—____ the workers are very tired, ____they keep on working.— They are great. We must learn from them.
If Tony_____ to the corner this weekend, Bob will join him.
Her husband is a great cook. So she can enjoy _____ food every day.
—Would you mind opening the window?—____. Look at the heavy haze (霾) outside.