PAPER IS MADE FROM CELLULOSE FIBERS , ( ARE/ WHICH ARE/ THEY ARE/...

11. - ANH9- KIEM TRA HKII ( HAY- CO DAP AN)
ANH9- KIEM TRA HKII ( HAY- CO DAP AN)

11.

Paper is made from cellulose fibers , ( are/ which are/ they are/ which they are) in all cells