1. (2019七上·鄞州期中) 用方框中所给单词的适当形式填空，使短文通顺、正确。每词仅用一次（每空一词）。

on     under       grandparent     your     it

A: Come on, Jack!

B: Oh, no! Where's my bag?

A: Hmm...is on your desk?

B: No, and it's not the chair.

A: Oh! It's on the sofa.

B: Thank , Mom. Err...where's the map?

A: I think it's in your room.

B: Yes ,it's on their bed! And my hat?

A: It's your head!

B: Oh, yeah! Haha