Simply learn to live in the present, ________ think so much about the future or the past.
________do you think _________ the monitor of our class?
.We were about to go downstairs when the lights_________.
.Jack couldn’t answer the question_________ got the money.
—You did so much work today.You must be very tired. —No,I’m not_________tired.
According to news report,personal_________ of guns in the USA causes a lot of trouble.