31．The lecture mainly deals with the trouble young children have right from wrong .

Believe it or not，my sister and I are twins—Oh，you must have had the case________you were taken for your sister

To get my travelers’ checks I had to have the bank _____ a special check for the total amount.

The kind girl ________all her spare time she had ____ others.

inventions arewell received, but _____ function, they aren’t very successful