— When would it be        for you to go to the science museum with me?

— I am free this Friday afternoon. Let’s meet at 2 p.m. at the school gate.

— Have you       ?

— No. I had the wrong number.

Studies show that people are more        to suffer from back problems if they always sit before computer screens for long hours.

Ricky stepped forward to        front of the stage and began to sing in        loud voice.

      but he still can not understand it.

Mr. Lee, who        as a guide for over 10 years, is now a manager in a big travel agency.

In the school hall, where a meeting       , some students are busy preparing for it.

      the coming English speech competition will be a lot of work, so I need some volunteers to help out.

Rock-climbing is a breathtaking activity, very popular nationwide among young people,

      cooperation as well as courage plays an important role.

Your advice was a great help to us, without which all our efforts       .