I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased.
________about her son’s future, the mother has been sleeping very badly these months.
A ____will be offered to the information leading to the arrest of the bank robber.
When we are getting excited, angry or scared, our bodies also ______many physical changes.
History is the best teacher. It ______records the development path of each country and foretells the future to us.
---You needn’t take an umbrella. It isn’t going to rain.---Well, I don’t know. It __________ do.