The experiment shows that proper amounts of exercise,if___________regularly, can improve our health[ ]

________ our teacher is ill, ________ he still comes to our class to teach us.

1You should eat lots of_______, because it’s good for your health.

have asked witnesses of the accident to___________, as the victim is critically wounded, unable to give an account ofthe accident.

Has Peter handed inhis paper yet —I’mnot sureHe _______ on it last week