Cho A = 1+2+2^2+2^3+2^4+2^5+...2^99. Chứng minh rằng A không chia hết cho 7

1.they swim at the weekend = they go.....
2.Hanh enjoys playing the piano= Hanh is interested.......................
3. There is a garage in my house= My.........................
4 Let's study English = How.................................?