open the brackes using the subjuctive mood after the verbs:

a) the teacher of nature studies suggested that we (to help) people keep our parks, lakes, rivers and woods clean.

b) my friend Sorin proposed that we ( to feed) the starving birds in cold winder season

c) the government demands that the landowners (to introduce) less herbicides and pesticides into the soil.

d) mother recommended that the family ( to go) for a picnic in the woods on the bank of the Nistru river in Vadul^lui Voda.

e) the city authorities demanded that drivers ( to look after) their cars and not pollute the air.

f) the forester insisted that the campers ( to leave ) the picnic place clean.