Present tenses

We ... (not/know) when our cousins' flight arrives this afternoon.

I'm absolutely exhausted! I ... (revise) for my final exams all evening.

Andrew and I ... (be) best friends since we were in college.

At the moment, I ... (work) at a campsite to earn some extra money for my summer holidays.

Getting into a good university ... (become) more and more difficult each year!

Helen ... (not like) the idea of online learning very much.

Quick! The train ... (not leave) yet and we can still make it.

Sue _____ (see) the doctor later today about her

stomachache.

They must be at the sports ground now. They usually _____ (play) basketball on Fridays.

At present they (sit) ________ in the class.