1/When we sing ______________, we start to forget some of our depression. (cheer) 2/Environmental pollution has bad effects on the balance of ___________. (natural) 3/People say that Mary sings very well. =-> Mary 4/ She was ill, so she didn’t attend the lecture. =>If

4.----> If he hadn't been ill, he could have attended our meeting

1/When we sing _____cheerfully_________, we start to forget some of our depression. (cheer)
 2/Environmental pollution has bad effects on the balance of _____nature______. (natural)
 3/People say that Mary sings very well.
=->  Mary is said to sing very well.
   4/ She was ill, so she didn’t attend the lecture.
=>If she had not been ill, she would have attend the lecture.

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