Read the sentences carefully and fill in the blanks with suitable tense form of the verbs given in brackets.
1. The doorbell rang, while I _______ (do) my homework.
2. We saw an elephant, while we _______ (go) on a trip to Ooty.
3. Mary fell asleep while she ________ (read) a book.
4. The television was on but nobody _______ (watch) it.
5. Baskaran hurt his hand while he _______ (cut) mangoes.
