The computer system ______ suddenly while he was searching for information on the Internet. [ ]

I’m sorry. I forgot to bring my homework today.— _____ Please remember to bring it tomorrow.

to the Internet, we have_________ to data quickly and effectively, regardless of where we are and what we are doing.

How long do you believe it will be _____ Chinese people land on the moon?

Your sister _________ a lot during these years.—Yes. She _________ three years ago.