17. The Red List has been introduced to...
A. lift
B.grow
18. When he came, I
A. cooked
in the kitchen.
people's awareness of conservation needs
D.raise
C. rise
D. was cooking
to protect our health.
B. am cooking
C. has cooked
19. A face mask
whenever we go out of the house during the pandemic
A. must be wornB. must wearC. must wornD. must not be worn
in 1970 by my grandfather.
20. This house
A. built
B. was built
C. was build
D. has built
meaning to the underlined word(s) in each of the following