have to-can-can't-don't have to

You ............... wear a helmet when you walk.

You .......... climb up the volcano today, there's smoke near the top.

You ..........use a telescope to see Mars in the sky, but it helps a lot.

You ........... park here.

She ................ wear a jacket if it's not cold.

The door isn't locked, so you ............... come in any time you want.

You ........... cross the street now.

If you want to work at a construction site, you ............... wear a healmet and gloves.

You ............ enter this property.