Please do me a favor — ______ my friend Mr. Smith to Youth Theater at 7:30 tonight.

Some researchers believe that there is no doubt ______ a cure for AIDS will be found.

_____ your attention focused on practicing, and you can reach your goal of becoming an excellent pianist.

______seems to be no possibility that the student majoring in liberal-arts can win the first prize in the100-meter race.

“______,” the soldier screamed loudly, who held a gun in his hands, “or I will shoot again!”

Generally speaking, the harder one works, ____________.

In my opinion,        to worry about the present situation between China and Japan. Everything will be all right.