Some aspects(方面) of a teacher’s job ______ be tiring, and teachers often ______ work at inconvenient hours.

We’re still at the airport. If it weren’t for the delayed flight, we _____ the concert right now. [ ]

Why didn’t you go to the cinema with us yesterday evening —I________for my uncle from Beijing at the station.

Remember to the lights when you leave your classroom.

ung lady, ________ several attempts to fix her cell phone, decided to have another try.