1.isn't it?
2.don't you
3.won't I
4.does he
5.did she
6.do they
7.haven't we
8. didn't he
1. Convert
2. Distance, miles или kilometres
3.
4. Helped
5. Scientist
6. Length, meters, meters, multiply, meters cubed
7. Volume, volume temperature, temperature
8. Pole
9. Science
10. Measuring, bigger, mile, kilometer
1) will not have
2) did
3) attended
4) were
5) study
6) be able to
7) had
Здесь коротко ответить невозможно. Надо изучить использование артиклей в английском языке. По-хорошему, это тема на 10 - 15 уроков.