It’s important to eat a _____ diet.
| A．balance | B．balanced | C．balancing | D．balances |
There is a ______ tree in our school.
| A．20 meters tall | B．20-meters-tall | C．20-meter-tall | D．20 meter tall |
He spent a week ____ the novel.
| A．to read | B．in reading | C．on reading | D．for reading |
— I broke the window. — You ____ play football near the window.
A should B. shouldn’t C. had better D. must
—Must I come at four o’clock?
— Oh, no, you ____.
| A．don’t | B．mustn’t | C．don’t have to | D．can’t |
The students enjoy _________ English songs after class.
| A．practice to sing | B．practicing singing |
| C．to practice singing | D．to practice to sing |