1. visited
2.didn’t receive
3. designed
4. went
5.landed
6.didn’t invent
7.didn’t clean
8.Did you travel
9.bought
10. moved
11. went
12. started
13.Did you be
15.When did Columbus discover
16. Rain stopped;didn’t appear
17. What did they buy
18. didn’t see
19. had
20.started