anwser if you know only

Answer:
1. Themselves.
2.yourselves
3.herself
4.himself
4.ourselves.
Hope this helped! Sometimes you have to use each word in the sentence and see if it fits. for example 3. would not fit as Himself.
Explanation:
Answer:
1. The children ate all the cake themsleves.
2. Welcome, everybody! Just help yourselves to something to drink at the bar.
3. We saw the famouse actress herself at the weeding reception.
4. The president of the company himself is campaining against capital punishment.
5. We ourselves witnessed the crime happening in broad daylight.