He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

He decided to quit his job because it was a low salary.

His behavior became grounds for suspicion.

He was out of breath after running a long distance.

He explained the importance of studying while young, saying 'If you do not study when you are young, it will be difficult to learn when you are old.'

I fed the pigeons in the park.

I would rather go alone.