用所给词的适当形式填空
Would you please look after the little boy? His parents ____________ (not be) at home now.
I seldom eat sweets because they are bad for my ____________ (tooth).
Amy is very busy and doesn’t have much time ____________ (play) games. 
Kitty is in her bedroom. She ____________ (lie) on the bed and watching TV.
Mr. Wu teaches ____________ (they) Chinese this year.