You ______ worry about their safety. They are old enough to take care of themselves.
| A．mustn’t | B．needn’t | C．can’t | D．wouldn’t |
My brother is 3 inches ___ than I .
| A．tall | B．taller | C．tallest | D．the tallest |
Shanghai is one of __ cities in China.
| A．big | B．biggest | C．bigger | D．the biggest |
4That’s __ another story.
| A．an | B．very | C．the | D．quite |
This isn’t ___play I have seen.
| A．better | B．good | C．the best | D．best |
—I think robot will play an important role in our life. Don’t you think so?
—Yes. _________________________.
| A．No pains, no gains | B．Early birds catch worms |
| C．Great minds think alike | D．Facts speak louder than words |