Choose the correct passive voice: We should avoid tranquilizer in order to have a good health.

Tranquilizer should be avoided by us in order to have a good health.

Tranquilizer is avoided by us in order to have a good health.

Tranquilizer was avoided by us in order to have a good health.

None of these

Tranquilizer should be avoided by us in order to have a good health.

"Should avoid" changes to "should be avoided" in passive voice.

The subject "We" becomes "by us" in the passive construction.