By the time of last year, she ______ the piano for five years.

Lily, is this _________ ipad? –No, it’s not mine. I think it’s Lucy’s.

____ UFO landed on Center Park and ______ alien got out of _______ UFO.

Don’t make a noise! They _______on a physics problem now.

Must I clean the Lable now? – No, you ____. You may do it later.