Complete the sentences so that they mean the same as the original sentences.
1. It's a shame they did nothing to reduce traffic congestion in the capital city.
They ought ........ to reduce traffic congestion in the capital city.
2. Perhaps Paul is now preparing his Biology presentation about acid rain.
Paul may now .......... his Biology presentation about acid rain.
3. I'm sure the oil spill was not as serious as the media were trying to make it look.
The oil spill .............. as the media were trying to make it look.
4. It was not necessary for me to revise all the facts and myths about global warming for the test.
I ....... all the facts and myths about global warming for the test.