Jim, Tom is looking for his English book. Is this ______?—No, that is______. I don’t know wherehisis.

It was because of hard trainingthe sportsman won the gold medal in the competition．

The CD-Rom helps you learn English_________ your knowledge of English grammar and vocabulary.[ ]

Miss Gao is strictherself everything .

Due to the widespread ________ of this medical technology, more diseases can be discovered and treated at an early stage.