Sandra’s new boyfriend _____ be very popular. Everybody seems to know him.
must
It ______ be Hector at the door. He left the party an hour ago.
can’t
The dog ____ be hungry. Feed her!
must
It _______ be easy living in an extremely cold climate like in Siberia.
can’t
You know your grammar really well. This exercise _____ be difficult for you.
can’t
You’ve been working in the garden all day. You _____ be really tired now.
must
Running a marathon _______ be really difficult if you don’t run every week.
must
Phillip _____ be on Facebook. Everybody is these days.
must