Aplicația este accesibilă de pe ecrane late

05:00
Forests _____ be protected.
A: can
B: mustn't
C: must
D: should
We _____ recycle paper to save trees.
A: should
B: can
C: mustn't
D: must
People _____ cut down trees illegally.
A: should
B: can
C: must
D: mustn't
Trees _____ help produce oxygen.
A: must
B: can
C: should
D: mustn't
You _____ start a fire in the forest.
A: can
B: must
C: should
D: mustn't
We _____ respect nature.
A: must
B: should
C: mustn't
D: can't