【C6】A．thoughtB．knownC．understandD．found

A．thoughtB．createdC．supposedD．caused

【C3】A．thoughtB．measuredC．balancedD．considered

A．thoughtB．expectedC．suggestedD．advised

It took me two hours to figure out how to do it.A．guessB．sum upC．understandD．summarize

It is very difficult for a child to adhere to rules.A．rememberB．followC．understandD．learn

It is very difficult for a child to adhere to rules.A．rememberB．followC．understandD．learn