7/ John has been working for 5 hours. He ......... be very tired.
A. can
B. may
C.must
D. should
8/ ....... you please be quiet ? I'm trying to concentrate.
A. Shall
B. Do
C. Will
D. Should
9/ .......... I carry the bag for you ?
A. Shall
B. Do
C. Will
D. Should
10/ Thanks for lending me the money. I ......... pay you back on Friday.
A. can
B. may
C. will
D. should