15. A:
A. Watch out!
There's a car coming. - B: Thank you.
B. Don't do that.
16. A: Honey, you ate too many sweets today.
A. You shouldn't eat that kind of sweets.
C. If you do that, your teeth may be hurt.
17. I think we should
these envelopes.
A. reuses
18. My future house will
A. have
19.
A. Where
20. If we
A. protect
B. reuse
C. Don't sleep. D. Listen!
- B: Yes, Mom.
C. to reuse
eight rooms and 4 robots.
B. has
C. to have
did you watch on TV last night? - I watched the Fox Teacher.
B. What
C. When
our forest, we will help our planet.
B. protected
C. to protect
B. Don't do that again.
D. The sweets are tasty.
D. reused
D. having
D. How
D. protects