They are books that I like them very much. [ ]

How long have you read this book?_________________.

I called you yesterday evening, but nobody answered the phone.— Oh, I a walk with my parents at that time.

I’ve heard that he is seriously injured in the accident.— . He’s being treated in hospital.

I don’t know what ________ of students in that school is, but you can see there are _________ of bikes and e-bikes outside the gate.