________ 200BC, the Silk Road, which was the route for trade between the East and the West, was in use.
This kind of material can be used to _____plastics.
–You seemed to have been impressed by his songs. --Well, not exactly so. It was his way of singing _____his voice that really impressed me.
–Did you enjoy yourself at the party? --Yes, I’ve never been to ______one before.
Peter’s jacket looked just the same as Jack’s, but it cost ______his.
Not until I came home last night _____to bed.