用所给词的适当形式填空。 1. He was ____ _ (happy) because he failed the exam. 2. Don't make any ____ (noisy). The baby is sleeping. 3. She tried (escape) from the burning car. 4. Listen! There must be someone ____ (knock) at the door. 5. She used to (get) to school late, but now she is used to (get) to school early.