—I'm sorry I've taken your dictionary ______because they have the same color.
—It doesn't matter.
A. at once B. by mistake
C. in general D. as well
—Could you please sweep the floor? I’m going to cook dinner.
— ________. I’ll do it at once, Mom.
A. I’m afraid not B. You’re kidding
C. It’s a shame D. My pleasure
—How was tea invented？
—______
A. 5，000 years ago. B. By accident.
C. Shen Nong，a ruler. D. Over an open fire.
This kind of drink ______ a ______ smell. Many children like to drink it.
A. produces; pleasant B. is made; pleasure
C. was refused; glad D. protects; pleasant
Teaspoons are used______ things.
A. for serve B. to serving
C. to serve D. serving
—When ________ personal computers ________？
— In 1971.
A. was; discovered B. were; invented
C. were; discovered D. was; invented
