21.[A]small [B]educational [C]big [D]business

　　22.[A]claimed [B]called [C]spoken [D]told

　　23.[A]as [B]with [C]over [D]in

　　24.[A]money [B]discounts [C]priees [D]costs

　　25.[A]exciting [B]encouraging [C]despairing [D]disappointing

　　26.[A]ourselves [B]customers [C]companies [D]US

　　27.[A]to [B]for [C]in [D]with

　　28.[A]as if [B]even though [C]just as [D]although

　　29.[A]custom [B]literacy [C]poem [D]tradition

　　30.[A]artificial [B]human [C]wise [D]high

　　31.[A]capable [B]possible [C]probable [D]available

　　32.[A]compared [B]comparing [C]contrasted [D]contrasting

　　33.[A]than [B]above [Clover [D]from

　　34.[A]tools [B]robots Eelequipment [D]electronics

　　35.[A]other [B]big [C]little [D]robot

　　36.[A]expensive [B]artificial [C]educational [D]low-cost

　　37.[A]up to [B]to [C]in [D]about

　　38.[A]mechanical [B]standard [C]cheap [D]small

　　39.[A]much [B]many [C]both [D]some

　　40.[A]more [B]less [C]no [D]least