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isn't it

aren't you

did they

wasn't it

won't she

were they

1.can

2.could

3.will be able

4.can

5.can(сомневаюсь,не вижу перехода времени)

6.can

7.can

1. biggest

2. more sociable

3. more curious

4. better

5. cleverest

6. more beuatuful

1) was developed 

2) were all invented

3) were improved

4) are used

5) is brought

6) were sent

7) will predicted

8) will predicted