I didn’t quite follow him because he explained the theory _____that is too abstract for me.
—Please __________ us in the discussion.—I'd like to, but I'm __________ busy at the moment.
—Are you free tomorrow afternoon?—I'm afraid not. I'll have to ________ an important lecture given by a famous professor.
He divided the sweets __________ the children who were divided __________ three groups.
America and England are two countries ________ by a common language.
The event of Turkey's 7.2 magnitude earthquake was ________ live by TV.