sed our train, and ________ the next train wasdelayed, ________ we had to wait for another two hours

The problem ________ this material can beused in our factory has been solved.

Tell the boy the news. He is ______to understand it.

Has Sam finished his homework today — I have no idea. He ________ it thismorning.

ed you last night, but nobody answered—Oh, I usually___off my cellphone by 9:00 pm