英语语法求破啊A:I didn't do well on my last math test,so I got a pr

英语语法求破啊
A:I didn't do well on my last math test,so I got a private tutor to help me study.
B:A private tutor?You _______ OK on the next test,then.
A:can do
B:must do
C:should do
D:may will do
A:Have you ever run in a marathon?
B:I tried once,but I _______ it.
A:could complete
B:couldn't have completed
C:couldn't complete
D:can't have completed
A:Ow!This tooth is killing me!I'm going to go to the dentist's right now.
B:Wait.You _______ him first.His office might not be open today.It's Wednesday.
A:must call
B:can call
C:had better call
D:have to be calling
A:That package must be there tomorrow.Did you send it by express mail?
B:Yes.I sent it by overnight express.It _______ tomorrow.The delivery company guarantees it.
A:could arrive
B:will arrive
C:can arrive
D:must arrive
A:I'm so nervous about the school play!What if I forget my lines?
B:Well,I guess there's a small chance that _______,but you'll probably do just fine.
A:could happen
B:must happen
C:should happen
D:happens