use，recycle，napkin，take，stay

（1）

Recycling

Recycling

paper is a really easy thing for everyone.
（2）To protect the environment，people shouldn't use paper

napkins

napkins

.
（3）We all

took

took

part in the school trip last week.
（4）His father

used

used

to drive to work，but now he walks to work.
（5）Let's go hiking instead of

staying

staying

at home，OK？