1.How old are you ?
=> What...................................
2.Living in the countryside is more peaceful than living in the city
=>Living in the city isn't .....................................
3.My sister likes surfing the internet to look for the information
=>My sister is........................................
4. We stopped the football match because of the heavy rain
=> Because it ................................................
5. We started learning English when we were in grade 3
=>We have.......................................................
6.It isn't necessary for the students to wear uniforms on Satudays
=>The students................................................