кто шарит в английском! Use Present Perfect or Past Simple.
1. …(you/ever/be) to the United States? 2. My hair is clean. I…(wash) it. 3. I…(wash) my hair before breakfast this
morning. 4. When I was a child, I…(not/like) a sport. 5. Kathy loves traveling. She…(visit) many countries.

1. Have you ever been to the United States? (Тут указано ever, поэтому Present Perfect)

2. My hair is clean. I have washed it. (Результат с нами, волосы чистые! Present Perfect)

3.  I washed my hair before breakfast this  morning. (Я помыл свои волосы после завтрака этим утром, тут Past Simple)

4. When I was a child, I didn't like a sport. (Past Simple, т.к когда он был ребёнком, он не любил спорт. (это было давно))

5. Kathy loves traveling. She has visited many countries. (Present Perfect, результат с ней)