Нужно вставить предлог в соответсвии с картинкой

  5  предложениe

the university of california and the state university of new york are two examples of such public schools.

1. the boys are playing football now. they are tired. they have been playing football an hour and a half.

2) tom began talking on the phone an hour ago. i think he should finish. he has been talking on the phone for more than an hour already.

3) roy came to see  the dentist at nine o`clock. it is 9: 30 now.

roy has been waiting for the doctor since 9: 00 a.m.

4) colin became a professor in 1998. he has been working at the university since he became a professor.

5) the greens went to canada last summer. they are living in canada now. they have been living in canada for about a year.

both of us came to the theatre.

neihter of us went to the horse-racing.

both of us like watching tv.

neither of us prefer playing computer games.

both of us like riding bicycle.

problem - в переводе с "проблема"