Giúp mình 3 câu này vớiiii 1. Photographer often travel around a lot ........ some of them word in a studio. A. for example B. because C. although D. as a result 2. Being a waiter is very tiring because you have to be ....... your feet all day long. A. on B. in C. for D. off 3. He is so funny and charming, so I ended up ...... on the phone for hours A. Stay B. to stay C. Stayed D. Staying