从下列词语内选出单词, 并用其适当形式填空

clean, sound, are, read, want

l．Ben ________ to learn Chinese this year．

2．－What is she doing?

－She is ________ the classroom．

3．－Let's go to the Great Wall．

－That ________ good．

4．－What is your grandfather doing?

－He is ________ a newspaper．

5．－Are they using the computer?

－Yes, they ________．