there's a discount_____last year's book?

there's a discount_____last year's book? There are four s() in a year there's a d____ on last year's cards. There's a book under the desk.还有There’s a tow balls behind t There are three [s ]under the tree.there【s】 a fantastic book There is a book on the table.对画线部分(a book)提问答案是what's there He has worked there (s) last year there's something behind the book This is s book.(a book提问) 1.There's _______ English book on_______ desk.________ book There's ______ ______ ______ (打折) last year's clothes. 这样回答对不对：A：How many months are there in a year?B：It's twelve