____， is this your pencil —-Yes， thank you.

Why, my new computer is rubbish! Five hours has passed and it still hasn’t finished the downloading. —Don’t worry. You know, sometimes the Internet ________ be very slow.

We’ll make a trip to Hainan Island next weekend. Will you go with us—No, I can’t _____ it at present because I have little money.

The left-behind kids(留守儿童)can’t see their parents_________ the parents come back home from work.

With his attention _____ on his book, he didn’t notice me enter his study.