Air quality in our city is becoming worse and worse.—Yes. These days’ PM2.5 readings are frightening. We must do something to ______air pollution.

______ is too difficult if you put your heart into it.

________, the Internet was only used by the government. But now it’s widely used in every field.[ ]

Not only ______ do this work, but ______ finish it on time. [ ]

The second Sunday of May is ________ Mother’s Day. It’s ________ special day for children to show their love for their mothers.