One is never _____ old _____ learn. Do you think so?—Yes. I agree.[ ]

The summer vacation is coming．Do you have any ideas about the coming vacation?－I volunteering in the old people’s home．What do you think of it?

Tom. Why do you look so tired? — Because I often study late ______ 10 o’clock at night.[ ]

My father is able to _______many different kinds of computers.

English is my favorite subject, and I am good ______ it.[ ]