Present/ past passive voice

The animals ... (give) antibiotics and hormones

Human health ... (affect) by eating meat containing antibiotics

Many animals ... (keep) in tiny spaces

A lot of land ... (need) to grow food for animals

Global warming ... (cause) by greehouse effect

The environment ... (not destroy) by riding bicycles

Different types of food ... (bring) to the supermarket

Oil ... (discover) in the desert last month

These vegetables ... (not grow) organically

Two recycling plants ...(build) in our town last year