The seeds/plant/the gardener/last week.
The seeds were planted by the gardener last week.
The presents/usually open/the birthday boy or girl/at their party.
The presents are usually opened by the birthday boy or girl at their party.
The presents/open/the children/with great excitement.
The presents are/were opened by the children with great excitement.
Our river/once pollute/industrial waste from factories.
Our river was once polluted by industrial waste from factories.
The ocean/pollute/oil spills/in the past.
The ocean was polluted by oil spills in the past.
The classic film/watch/generations of moviegoers.
The classic film is/was watched by generations of moviegoers.
This cartoon/watch/audiences/ in over 50 countries.
This cartoon is/was watched by audiences in over 50 countries.
The flowers/admire/visitors/garden.
The flowers are/were admired by visitors in the garden.
The roses/smell/the girl.
The roses are/were smelled by the girl.
Halloween/celebrate/in autumn.
Halloween is celebrated in autumn.
