— Where did you find your lost pen?—It was in the park _____ we visited that day _____ I found it.
We go for a walk in the fields ___________, but not often.
Don't be rude to your father. Never in his life ___________ that way.
It seems that living green is ___________ easy and affordable. A small step makes a big difference.
We only had $ 100 and that was ___________ to buy a new computer.
—Volunteering is becoming ___________ popular in China. —Yeah, people are now aware that helping others is helping themselves.