The students _________ on what to do at the clean-up event tomorrow.

A number of trees _________ down to make space for the construction site last week.

The polluted water _________ by the factory yet, so it still flows directly into the river.

A new bridge _________ to reduce traffic jams at the moment.

New recycling bins _________ around the city at this time last week.

Cuc Phuong National Park _________ by thousands of people each year.

As planned, more trees _________ in the city next month to make the air cleaner.

The students _________ the importance of saving energy by Mrs. Greens right now.