Tom dropped in to see us on his way________ home from the theater.

We do have the most supportive parents and teachers, ________will make a difference to our study, unless all of us make every effort .

Don’t arrive late __________class, Tony.— Sorry, Ms Wang.

I wonder if your brother will go to the party. If he does, so ______mine.

The science of medicine, _______ progress has been very rapid lately, is perhaps the most important of all the sciences.