【C18】A．rightfulB．carefulC．usefulD．helpful

【C18】A．thatB．whichC．whatD．／

A．useB．usedC．usefulD．usefulness

Packaging is designed so as to encourage impetuous shopping.A．extravagantB．carefulC．impote

【C20】A．consciousB．carefulC．worriedD．wary

A．complexB．carefulC．diligentD．elastic

【C7】A．carelessB．carefulC．carefreeD．cautious