When he was doing the software development project, he ___________ many problems that he had to solve on his own. 

—Why is the famous althlete absent from the game?—He has been________to take part in competitions for a year because of taking drags.

21．The moment we heard the news of the earthquake, we began to ________ the work to rescue those who were trapped in the building.

The doctor told her that her badly­ injured husband had a 50­-50 chance of ________.

—Did the film                    your expectation?—Yes.In reality it is the best film that I have ever seen.