She agreed (to go) to the party.

(a)  

I want (to be) a doctor.

(a)  

You should (to study) harder.

(a)  

The teacher let us (to go) home early.

(a)  

We were made (to wait) outside.

(a)  

They seem (to know) what they're doing.

(a)  

I heard them (to argue) in the next room.

(a)