A、They are easy to take care of.B、They grow vigorously in gardens.C、They require specific commitment.D、They are helpful for economy.
（3）、Choose the best answer
A、It multiplies shopping trips.B、It is a waste of energy.C、It encourages fertilizer use.D、It increases the demand for plastic.
（4）、Choose the best answer
A、Impacts and approaches of pollution.B、Founders and missions of a community.C、Benefits and problems of houseplants.D、Studies and worries of an initiative.
