1- Christopher Colombus ( to land ) in America in 1492.
2- I ( to lose ) my keys. What shall I do ?
3- I ( not to meet ) him yet. What does he look like ?
4- A few years ago, the Turners ( to settle ) in Canada.
5- It's only 10.o'clock. I ( to answer ) quite a few letters this morning.
6- The Americans ( to drop ) [?] the first atomic bomb more than 40 years ago.
7- Thomas More ( to have ) his head cut off in 1535.
8- "How long ( you sleep ) last night ?" "Only 6 hours."
9- How long ago ( you write ) that book?