Помогите пожалуйста сделать задание 3

Put the verbs in brackets into the correct Present Perfect form and fill in 'for' or 'since':

a) Paula (has not had) a holiday since last summer.

b) Maric (has not had) a driving accident since she was in Spain.

c) They have not (taken) the exam since last May.

d) I (has not studied) so much for a long time.

e) These students (have been) here for five years.