1.you need your flight number when you check in 2.in some countries, the taxi drivers only accept cash 3.travelling to another country involves a lot of paperwork 4.notify payroll f time off should come from sick time.

Согласование времен тема,там свои правила
Если действие в придаточном предложении происходит одновременно с действием в главном предложении, то нужно использовать past simple или past continious they told us:we are going to the library
they told us they were going to the library
Если действие в придаточном предложении предшествует действию в главном предложении, то глагол в придаточном используетсяв past perfect p p continious
we were told  that it had been raining a lot
we were told;it was raining a lot
Если действие в придаточном предложении следует после действия в главном, то нужно использовать одно из времен  future in the past
she said;i will try to get the highest mark on the exam
she said she would try to get the highest mark on the exam

I'm studie in 9 high schools. In the city of Kaluga. Lyceum 80 years. We do not have a mandatory school uniform, but there is a strict dress code. in our school there is a museum dedicated to KE Tsiolkovsky. This museum has a lot of his stuff. There chrono his bike, school desks and umbrella. The museum has many of his portraits. Also in the museum is an old school uniform girls, because it was a school for girls only. In our school there are clubs, such as quilling, volleyball, football.I do not go to clubs, since I do not have time. Each year, we spend the day government. In zhtot day high school student conduct lessons at primary school, and the teachers have a rest.