Task 8.

1) caused
2) redone
3) provide
4) obtained, taken
5) encountered

Task 9.

1) considerable
2) obtained
3) numerous / encouraging
4) consequences

5) slightly, moderately
6) extremely good
7) doubtful
8) congregate

Task 10.

1) If the exam is not passed, it is not possible to enter the university.
2) We should now ask to ourselves which are the causes of deformation, considering that there are many possibilities.
3)   Considerable differences between these two processes can be seen.
4) A small bit of ammonium dichromate is gradually added to the gelatin solution.
5) These special tax laws have been enacted in six state: Illinois, Iowa, Ohio and other american states.
6)  The subjects have little difficulty with the task.