Besides, you'll also conserve energy if you take a bus, a (4)_______, or a subway.

train         

Script:

Dr. McMann is an environmental scientist. Her job is to find ways to conserve energy at school, at home, and at work. She says that if you want to conserve energy, you should plant a garden and grow your own vegetables. You can also recycle bottles and cans after using them. She also advices that if you use energy-saving light bulbs and turn off the lights when leaving a room, you can conserve electricity. Besides, you'll also conserve energy if you take a bus, a train, or a subway. Remember, you don't have to drive your car everywhere.