It is __________ you do rather than __________ you say __________ matters.

Mr Green, there is someone at the front desk ______ would like to speak with you.—OK, I’m coming.

There ______________ great changes in our hometown in the past fifteen years.

nobody else at hand, I had to carry the heavybox to the eighth floor by myself.

No one knows when the house was built , but it must be very old.