You answered one task out of 10 correctly. That is 10%.

1.      Robert made this T-shirt -----

Correct is: Robert made this T-shirt himself.

2.      Lisa did her homework ----

3.       Correct is: Lisa did her homework herself

4.      We helped -------- to some Coke at the party. 

Correct is: We helped ourselves to some Coke at the party.

5.      Emma, did you take the photo by -----

Correct is: Emma, did you take the photo byyourselF ?

6.      I wrote this poem myself.

7.      He cut -------- with the knife while he was doing the dishes. 

Correct is: He cut himself with the knife while he was doing the dishes.

8.      The lion can defend -----

Correct is: The lion can defend itself.

9.      My mother often talks to -----

10.   Correct is: My mother often talks to herself.

11.  Tim and Gerry, if you want more milk, help ------

Correct is: Tim and Gerry, if you want more milk, help yourselves.

12.  Alice and Doris collected the stickers -------

Correct is: Alice and Doris collected the stickers themselves.