You needn’t have ________ the speaker when he wasspeaking; there was enough time afterwards for you to ask questions.

They urged the students _______ the work on time.

— Why are you so late? I _____ for more than an hour.— I’m terribly sorry. I overslept and missed the bus. [ ]

Generally, a farmer has more difficulty than a college graduate. [ ]

Look! There are many in the sky. I think it will be tomorrow.