G6-U5-L2

We ____________ step on the grass in the yard.

Everyone ___________________ wear a life vest when boating.

Students ___________________ pick flowers in the school garden.

We __________________ leave now or we'll miss the plane.

They ___________________ drive a car without a driving licence.

Your hands are dirty. You ___________________ touch anything.

In Britain, you ___________________ drive on the left.

We ___________________ book the tickets before it's too late.

You ___________________ use a mobile phone when the plane is taking off.

You _______ go mountain climbing alone. You _______ go in a group.

• must - must

• mustn't - must

• mustn't - mustn't

• must - mustn't