Which of these can refer to a boy but not a girl? a. cantante b. bailarin c. atleta d. joven

Cantante = singer (masc. or fem.) - el cantante, la cantante
bailarín = dancer (masc.) - el bailarín
atleta = athelete (masc. or fem.) - el atleta, la atleta
joven = young / young person (masc. or fem.) - el joven, la joven

B. Bailarín can refer to a boy, but not a girl, because the feminine is bailarina. All the others can refer to both boy or girl. 

Im guessing you should pick a word and put in the blank? 1. estoy2. estaciones del año3. verano4. invierno5. primavera 6. norte7. un abrigohope this you.