At home, he keeps some pets, to which he ______ all his spare time.

Thank you very much for showing me how to use the new mobile phone.— _______

Look, a group of students are playing the violin there, ____their teacher as the conductor

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

The boy____ a blue shirt is ____ duty .