一. 单选题1. As we are _ the market for tablecloth, we should be glad if you would send us your best quotation. a. in b. on c. entering d. at2. We _ a copy of our pricelist. a. put b. enclose c. envelop d. wrap3. We shall appreciate samples _ your offer. a. concerned b. covered c. including d. covering4._ receipt of your instructions we will send the goods. a. In b. Having c. U
