จงเติม since หรือ for ลงในช่องว่าง
Example : She has swum in the river for a long time.

1. I have written a letter …………………………. seven o’clock.

2. My mother has drunk coffee ……………………….. ten minutes.

3. My friends have played football ……………………….. last week.

4. They have walked to the zoo …………………….. a long time.

5. John has read a newspaper ………… this morning.