Passive voice with modal verbs

Trash must not be ___________________ at the beach.

• throw away

• threw away

• thrown away

• trowing away

Trash ________________ (must, recycle).

Homework __________________ by the students.

• must be doing

• must be done

• must be did

• must be do

Natural resources _________________to protect our planet.

• must not be conserved

• must be conserve

• must not be conserving

• must be conserved

Flying cars _________________ (may, create) in the near future.

Documents _______________ (can, organize) by name or color.

• can be organized

• can organized

• can be organizing

• can be organize

Questions _________________ (can, answer) in 10 minutes.

Ecological houses _____________ (can, build) in the city.

The rules ____________ (may, forget) quickly.

• may forgotten

• may be forgot

• may be forgotten

• may be forget

Sentences _________________ (can not, read) by him.