根据句意，用括号内所给单词的适当形式填空。

1. These __________(library) are very big and there are many books in them.

2. Would you like to help __________(I) with my English?

3. Tomorrow is Sunday. Let’s go____________(shop)!

4. — Where is your classroom?

    —It’s on the __________(one) floor.

5. Do you know those ________(policeman) telephone numbers?