1．It is wise to put __away__ some money in case of the old age.
2．Some minerals are quite common,others are regionally __distributed__(distribute),and still others are rare on the earth.
3．I had one of my feet __injured__(injure) when playing football.
4．What shall we use for power when all the oil in the world has given __out__？
5．I'll hold __on__ for another few minutes if you like.
6．The judges remarked __on/upon__ the high standard of entries for the competition.
7．__On__ first acquaintance she is cool and slightly distant.
8．If you swear __to_do__(do) something,you promise in a serious way that you will do it.
9．He opened his eyes wide __in__ surprise when he heard the news.
10．It's already 10 o'clock.I wonder how it came __about__ that she was two hours late on such a short trip.
