Christopher Columbus was ______ explorer from ______ European country.

ng got up very _______,so he came toschool half an hour ______.

When our parents are not at home, we need to ______ ourselves.

Jack won the first place in the writing competition.—_______. He had prepared for it for a long time.

accidents, _________ forty-five people losttheir lives, have renewed concerns over the safety of overnight buses.