1.at->in

2.ply->flying

3.is->are

4.running->run

1e,2a,3c,4b,5d

Yes, they are

1. is 2. skipping 3. skating 4. are playing football

Her arms are strong

1.what

2.why

3.how many

4.who

5.what time

6.how old

7.why

8.when

9.how many

10.how old

11.what time

12.who

13.where

14.whose

15.how

16.what

17.how many

18.how much

19.whose

20.what

21.where

22.how much

23.where

24.how

25.whose

Nhiều người=don't

1 người là doesn't

lot