half an hour‘s walk为什么不能讲成half-an-hour walk?练习册上的一道习题是这样的,答案选择了这两个选项中的前者.但不是有ten-minute walk吗?究竟half-an-hour walk行不行?求教谢谢

( ) ( ) ( )your house from here?Half an hour's walk. It's about _________ from my home to the Grand Theatre.A.half an hour's work B.half an hour walk C.hakf an hour walks D.half an hour's walk it's half an hour It is half an hour's walk from the school to the park.（ 对half an hour's walk 提问） It's about half()walk选择序号A.an houar B.a hour C.an hour's D.past How far is the airport?it is about____.a)alf an hour's walk b)half an hours c)half an hours' walk d)half-an-hour walk选哪个,最好有为什么 Who always takes a walk for half an hour in the evening?take 加不加s? My home is[ half an hour's walk]fron school 对画线部分提问 【如题】Mary was tired________ half an hour's walk on the beach.用【【介词】】填空 it took him half an hour to walk there.划线部分提问（half an hour） It takes me half an hour to walk to school. I ususlly go( )(walk)for half an hour It’s half an hour's walk from here to the bus station该句的结构 —Where is his farm?________?—No,not very far.It is about half an hour’s walk. 0.5hour Half an hour哪个加s half an hour‘s walk为什么不能讲成half-an-hour walk?练习册上的一道习题是这样的,答案选择了这两个选项中的前者.但不是有ten-minute walk吗?究竟half-an-hour walk行不行?求教谢谢 It's only( )by bus.A half an hours' B half an hour's C half an hour It takes me half an hour to walk to school.为什吗是take呀?英语高手请进