Ответьте на вопросы :
1. America ... by Christopher Columbus
a) was discovered
b) has discovered
c)discovered
d) is discovered
2. This letter... with the pencil
a) writting
b) is written
c) written
d) has written
3. Whon this novel ... by?
a) writing
b) was written
c) written
d) has written
4. The rooms ... and looked tidy.
a) were cleaning
b) cleaned
c) were cleaned
d) are cleaning