Before I began this job, I _____ a baby sitter for two years. [ ]

To protect the environment， supermarkets don’t ____free plastic bags to shoppers.

There is a beautiful park near your school, _______—Yes. I often go walking there.

The large family is really a heavy_______ on hisshoulder, so he has to work day and night.

Feathers fall to the ground slowly, ________ stones fall much faster.