用be动词的适当形式填空。1. I ______________ Xiao Ming. I ______________ nine years old.
2. Dick ______________ a singer.
3. Excuse me, ______________ you a teacher?
4. Tom and Lucy ______________ good friends. They ______________ in the same class.
5. What day ______________ it today?
6. It ______________ not a penguin (企鹅).
7. These boxes ______________too heavy for me.
8. There ______________ a tree on the hill.
9. There ______________ many birds in the sky.
10. My name ______________Martin. I ______________ from Australia. 1. am, am 2. is 3. are 4. are, are 5. is 6. is 7. are 8. is 9. are 10. is, am