. Your essay is quite good: just _____ it _____ with a few illustrations and quotations.
.The advertisement says the vacuum cleaner (吸尘器) can ______ everything from the floor. Do you believe it?
.When I knew Mary made every effort ______ the homeless, I could not but ______ her.
.About 71% of the earth’s surface ______ covered with water, but 20% of the world population ______ have access to safe drinking water.
.— Have you thought of a theme for your poster yet? — No, I ______ a lot about it, but I haven’t decided.
.______ left before the deadline, it doesn’t seem likely that John will finish the job.