A．experimentsB．checksC．discoveriesD．works

【C8】A．paperB．checksC．testD．quizzes

How does the man want to pay？A．In cashB．By personal checksC．By visaD．By credit card

John is cooperating with Mary in writing an article.A.working forB.working outC.working in

【C12】A．works outB．works upC．comes outD．comes up

【C4】A．work withB．work outC．work toD．work up

【C7】A．experimentsB．requirementsC．supplementsD．installments