1) complete com yet already:
a) -have you done your honswork _____?
-yes, I have _____ done it.

b) -Have the children taken their medicine _____?
- no, they haven't takes it _____.

c) -Has the secretary written those littles _____?
- yes, she has ______ written then.

d) -have you paid the bill _____ ?
- yes, I have _____ paid the bill.​