he is poor, he’s ready to help his friends who are in trouble, which makes him very popular

No sooner had he finished histalk he was surrounded by the workers

the local authorities put more attention to thesafety of the children, more than 20 lives __________ in Gansu Province.

It seemed a pity they ate it after all the trouble they had _____in making it.

Vitamin D helps our bodies make a special chemical，and this special chemical，________，affects our brains，making us feel happy