Rút gọn biểu thức 1 x + 2 + 1 ( x + 1 ) ( x + 2 ) + 1 ( x + 1 ) ( 2 x + 1 )  ta được

A.  x + 2 x + 1

B.  2 x + 1

C.  2 2 x + 1

D.  1 2 x + 1

Give the correct form of the verbs in the brackets

Nam is my pen pal. He (1. be) ____________ 14 years old. Last year, he (2. live) ____________ in Hai Phong with his family but now he (3. live) ____________ in Da Nang with his aunt. Yesterday, I (4. receive) ____________ his letter. He said “I usually (5. have) ____________ bread and milk for breakfast. I often (6. go) ____________ to school six days a week. My school (7. be) ____________ very big. I sometimes (8. go) ____________ fishing on the weekend with my friends here. I am very happy”. Last week, I (9. write) ____________ a letter to him. I introduced myself and (10. send) ____________ him a photograph of my family.