HE IS TIRED... HE STAYS UP LATE WATCHING TV.A. SO B. BECAUSE C. BU...

21. - 400 CAU TRAC NGHIEM GIUP ON TAP TIENG ANH LOP 9
400 CAU TRAC NGHIEM GIUP ON TAP TIENG ANH LOP 9
21. He is tired... he stays up late watching TV.A. so B. because C. but D. and