You ___ stop when the traffic lights are red.

• A. Might

• B. Must

• C. Would

___ I open the window?

• Need

• Must

• Can

He ___ be in his office, but I'm not sure.

• Has to

• Can

• Might

They ___ be at the party because they are out of town.

• Can't

• Must

• Should

___ you pass me the salt?

• Could

• Shall

• Must

Children ___ play with matches; it's dangerous.

• Must

• Mustn't

• Can

You ___ be 18 years old to vote.

• Must

• Can

• Might

___ I suggest a different approach?

• May

• Have to

• Cannot

Passengers ___ not smoke during the flight.

• Can't

• Need

• Must

You ___ turn off your phone in the hospital.

• Can

• May

• Must