1. Everyone has the right to live where he wants to, regardless (of )the color of his skin.
-----If something happens regardless of something else, it is not affected or influenced at all by that other thing.
2. The disease is spreading, and all the children under five are(at)risk.
-----To be at risk means to be in a situation where something unpleasant might happen.
3. We will not have picnic unless more people sign (up).
4. If you impose your opinions or beliefs (on)other people, you try to make people accept them as a rule or as a model to copy.
-----If you impose something on people, you use your authority to force them to accept it.
5. Before I pay I’d like to know what I pay (for).
6. Twice he had raised the money and started (on) a small business of his own, and twice he failed.
7. The university consists (of) 16 schools with a total number of over 25,000 students.
-----Something that consists of particular things or people is formed from them.
8. One thing that she can’t stand(up to)is that they have treated her as an irresponsible teacher.
-----If you stand up to someone, especially someone more powerful than you are, you defend yourself against their attacks or demands
9. From the activities they are engaged (in), we can see they are not so honest.
---If you engage in an activity, you do it or are actively involved with it.
10. I’m afraid you have to account (for)your being away from class yesterday.
----If you can account for something, you can explain it or give the necessary information about it.
1. of
2. at
3. up
4. on
5. for
6. with
7. of
8. for
9. in
10. for