It's not a good for students to go online just for answers to homework．（ ）
A．skillB．gameC．hobbyD．habit
You'd better make a good plan________ you take a holiday．（ ）
A．beforeB．duringC．untilD．after
A smile costs ， but gives so much．（ ）
A．somethingB．anythingC．nothingD．everything
Lisa was so careless that she made many spelling ________ in her homework．（ ）
A．plansB．decisionsC．gradesD．mistakes
If you read a lot，your life will be full ________ pleasure．（ ）
A．byB．ofC．forD．with
Fred is always ____ because he often does something good for his health outdoors．（ ）
A．weakB．nervousC．seriousD．energetic