1 . It is the ________ in this country to go out and pick flowers on the first day of the spring．

A．use	B．custom
C．habit	D．normal

2 . In case of emergency, whether knowing how to apply first aid or not really ________ in matters concerning wounds like swollen wrists, broken arms, burns, cuts, and so on.

A．makes difference	B．makes a difference
C．makes differences	D．makes different