They really have a great time too, designing everything, drawing the blue prints, _______the angles(角度)and so on.
Hie risk of heart disease is a powerful argument ___________ smoking.
It is a serious novel, not ___________.
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.