Complete the sentences. Use ‘couldn’t + V-inf’ or ‘couldn’t have P2’

Ex4. Complete the sentences. Use ‘couldn’t + V-inf’ or ‘couldn’t have P2’
afford               study                   stand               be

1. The staff at the hotel were really good. They _ more helpful.
2. There’s no way we could buy a car now. We it.
3. Jack prepared for the exam as well as he could. He __ harder.
4. I wouldn’t like to live near the motorway. I the noise of
the traffic.