21. — I’ve just been to my first language class.
— Oh really? ________ . Which language are you studying?
A. So do I B. So have I C. So I do D. So I have
22. He said that light _______ much faster than sound.
A. travel B. travelled C. travels D. is travelling
23. It is ______ heavy a box _____ no one can move it.
A. such; that B. so; that C. too; to D. such; as
