choose the correct tense.
1. I have been watching / I am watching TV for two hours.
2. My sister has been visiting/ is visiting China.
3. Lin has been hiking/ is hiking in the mountains for three days.
4. Laura has been having / is having dinner at the moment.
5. I have been writing / am writing a letter.
6. Ben has been skiing / is skiing since he was five.
Va roogg, foarte repedeee...​