Mark Twain worked for several years as a pilot on a steamboat, taking passengers up anddown the Mississippi, the great river ___flows from the north of the US near the Canadianborder.
Lots of people were reported______ in the earthquake, but so far we haven’t found out the exact number yet.
Upon graduation from school, how well will you ______ the job that lies ahead?
What really worries us is ______ the explorers can accurately locate themselves with the device in case of bad weather.
— It rained heavily yesterday. Did you get wet ? — Quite lucky, ______ got on the train when it poured down.
A newly designed skyscraper is being set up ______ the World Trade Center used to stood.