Final answer:
The blanks in the sentences should be filled in with 'has' for present perfect tense, and 'had' for past perfect tense, while keeping in mind the subject of each sentence.
Step-by-step explanation:
To correctly fill in the blanks with have, has, or had, we need to consider the tense and the subject of each sentence. Here's how they should be completed:
b) The house has been repainted. It now looks new.
c) Malik refused to eat anything at the party. He said that he had just eaten.
d) Exam malpractices have become a serious issue.
e) Last week, my friend went to Ghana. He had never been there before.
Note how the use of has and had changes depending on whether the sentence is in the present perfect or past perfect tense.