Điền is, am, are

Điền '' is , am , are ''
1. Which class .....you in ?
2. Whichs grade ....they in ?
3. .......your mother young? 
4 . ........your father young ?
5. Where .....the cat ?
6. Where ....the boys ?
7.Who ....those ?
8. Mai and I .....ten yaars old .  We ....in the same class
9. What .....their names. They ....lan and hoa .
10 What nationality ....Mrs Brown ? 
11 What color ...her dress ?
12 What color .... his shorts ?