Write the verbs in brackets in the past continuous or simple past tense.
1.We felt guilty about the old car because while we ____ （drive),we ____ (pollute）our city .
2.While we ____ （stay）at the Magic Hotel,my dad ____ （see）sea horses for the first time.
3.We ____ （not have）air conditioners in our house,because we ____ （save）energy.