1.When was asked to answer that difficult question,I was at a loss.
2.There are a big crowd of people who are protesting against war outside.
3.A special ceremony is to be held tonight in honour of those excellent scientists.
4.Seeing her lost child,the mother wept for joy.
5.Nobody would be spared from punishment if s/he is against the law.
6.Conducted by our monitor,the chorus gave a perfect performance,which has left me a deep impression.