Here are two tickets , Bob . is for you and is for your sister .
| A．One ; another |
| B．One ; the second |
| C．One ; the other |
| D．One ; others |
What ____________ we do to protect our environment?
A. do
B. shouldn't
C. can
We can save water and ____________.
A. energy
B. energys
C. energies
We shouldn't ____________ litter on the ground.
A. throws
B. throw
C. threw
What can we do to make ____________ mother earth more beautiful?
A. us
B. we
C. our
We can plant more ____________.
A. trees and grass
B. tree and grass
C. tree and grasses