I.1 is covered

2 was invited

3 are caused

4 is being built

5 wasn't stolen

6 would be sacked

7 was invented

8 are translated

9 will be cancelled

10 will be told

2.1 a dancing class was started last week

2 my briefcase has been taken

3 the report has been finished by noon

4 the accident was seen by MrSmith

5 the report has been finished by noon

6 the streets are being swept

7 my pen used to be borrowed

8 him ought to be told early

9 the room isn't used very often

10 the road to school must be widened this year