20.Scientists are looking for an............way to reduce energy consumption A.effect B.effection C.effective D.effectively 21.What can we do to spend less.............lighting? A.in B.on C.about D.of 22.You should take.............your shoes when you go into the temple A.in B.on C.off D.of 25.Her husband looks..............the children while she's at work. A.after B.for C.at D.to 27.Not wanting to be late for my first day of class,.............to school after I missed my bus. A.so I ran B.because I ran C.I ran D.therefore, I ran