is no doubt that the Great Wall is one of the wonders of the world.

______ is no _______ arguing with Bill because he will never change his mind.

_______ was a struggle for me to remember all the strange faces and new names.

----Who are you going to have           this letter for you?
----My secretary.

Use your head, _______you’ll work out the problem.

— _______  no ad during TV plays.
—Great move! I cannot tolerate those annoying ads appearing every several minutes.

—What a smart and hard-working boy he is!
—Right. ________ a possibility that he will win the first place in the competition.

As everybody knows，     a person I s，the more things he needs to do tomorrow.

Work hard at your lessons, ______ you’ll fail the exams again.