I was almost asleep last night when I suddenly heard someone ______ at the door.
Child as he was, he ________ a good idea to solve the problem.
With the development of science and technology, the prices of TV sets have ________.
Xu Beihong is most known ________ drawing horses________an artist.
The book, ________ for beginners,is popular with students.
The little girl can ride a horse and swim, and she can shoot ________.