Obligation, prohibition, persmission and ways to do things

Obligation

100

Guests _____ take the visitor's card everytime they get into the building.

Must

200

I ______ finish this report before Friday!

Need to (because it is a necessity)

300

I ______ meet with the representative today, to conclude the report.

Have to

Prohibition

100

Employees _________ to surf the web inside the building. It's prohibited. 

Are not allowed to / Mustn't (Because they can)

200

You _______ talk like that at the office! They'll fire you!

Can't

300

The CEO _______ let that opportunity pass. It will benefit the entire company.

Mustn't

Permission

100

Anyone _________ wear any type of suit, as long as it's decent-looking. It's part of the uniform.

Is allowed to

200

The president _______ talk in behalf of the company as long as it's good for everyone.

is allowed to

300

Employees _______ bring their own stuff to the office.

are allowed to / can

Ways to do things

100

Walk in the hospital ______.

quietly

200

Listen to your classmates ______.

respectfully

300

Students can ask questions ______ in this class.

freely