Complete the crossword

Across

1 This person sings modern songs — [ ].

4 This person is the leader of a country — [ ].

6 This person works in science and does research — [ ].

Down

1 This person has good knowledge and training in physics — [ ].

2 This person takes care of sick people — [ ].

3 This person writes books and stories — [ ].

5 This person draws or paints pictures — [ ].