an’t concentrate on his lessons recently.—-Yes, that might _____ his low score in the lasttest.

As a result of the injury, he gave up the games. —_____ He missed the chance to win a gold.

s, Mark, what is the cause of the American Civil War—Well, is it _______the black slaves wanted freedom

She will have learned English for 10 years by the time she _____ from the university next year. [ ]

Neither my sister nor I been to America before.