In which sentence is all PUNCTUATION correct?

The Holy Mosque in Makah....... by billions of pilgrims for hundreds of years.

A huge amount of cake ............... at the party.

Which is the BEST WAY to combine the two sentences? “There was a discussion in class today. It was very interestin…

When the students …… hard, they pass their exams.

If Ben gets a new job, he ....................... a nice apartment.