________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
This evening desert exploration includes exciting drive, camle ride and Arabic food and music.
--- Where was the park that the author described in his latest book? ---___ was near the zoo ___ we took many photos last month.
.---Why did he___ that the man we met on the bridge was his father? ---God knows!
.We were informed that the woods behind our apartment building would be removed to___ a swimming pool for the residents.
.To be an astronaut, you must not only be strong in mind, but also be sound mentally and___.