He is one of my best friends.
One should be careful with one’* money while travelling.
Between you and me, neither is appropriate.
This is the right way to assess your employees.
We must rise to the occasion.
He is the cleverer of the two.
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OR
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- He works hard.
OR
He hardly works. (The meaning in the two sentences is different. In fact, the meaning in the first is opposite to that of the second. In the first, it means hard work. In the second it means doing almost no work.)
of the boys had learnt their lesson. (Please note that this sentence can be taken as the correct sentence. However, we can also write, ‘ of the boys had learned their lesson.’ Also, we can take none as singular and write, ‘ of the boys had learnt/learned his lesson.)
The ship sank.