— Is Jim coming by train?  — I’m not sure. He_____ drive his car.

I chose the most popular major instead of my favorite one，but I had to drop out and started again where I＿＿＿have gone in the first place.

----The task is challenging and demanding. Who do you think can make it?---- ___________my partner have a try? I think she is the right person to do it.

—Must I clean the blackboard now?    —No, you _______ clean it later.

—Tom graduated from college at a very young age.—Oh,he__________have been a very smart boy then.