SHE IS VERY HAPPY TO WORK BY THIS NEW SEWING MACHINE.A. ISB. HAPPYC...

9. - 3500 CAU TRAC NGHIEM ON TAP AV THCS
3500 CAU TRAC NGHIEM ON TAP AV THCS

9. She is very happy to work by this new sewing machine.

a. is

b. happy

c. to work

d. by

-> d

III. Grammar and Vocabulary