The idea ________ good. We can try it.

_____ the right kind of training, these teenage soccer players may one day grew the international stars [ ]

－Who’s that young man on the poster －Justin Bieber, excellent singer.

Among the 15-year-old children, some ____ studying in university while others are still learning to read and write.

Look at the boy playing basketball on the ground. Isit George— It ________ be him. He told me he would playbasketball after class, but he’s not sure.