Respuesta :

a] she feels very happy because Karen passed all her exams

b] I can't understand her although my teacher speaks very well

c]Maria isn't a professional singer but she sings very well

d] it was snowing heavily so we stayed at home

e]the doorbell rang while I was washing the dishes

f]I waited outside the cinema until my friend arrived

g] i did a lot of shopping when I went to Paris