The two boys look _______ much alike _______ no one can tell them apart. 

He is really considering ______ himself to ______ these children of the poor mountain village.

The newly published book, which refers _______ basic English grammar, is _______only for beginners. 

The boss insisted that every minute ______ made full use of ______ the work well.

——You don’t go to that supermarket quite often, do you? —— No, I only go there ______ because it’s too far away from my house.