I.complete the second sentence so that it means the same as the sentence before

1.my brother is hard working; therefore, he usually gets high scores on exams.

2.finding bookshops in any town or city was easy.

3.''mai will take an online course to improve her speaking''.

4.it's not good for us to use smarrtphones for more than a few hours every day.

5.local authorrities gave a flood warning yesterday.today people are moving to safer places.