​2. My salary isn't as high as yours.

3. You don't know as much about cars as me.

4. It isn't as cold as it was yesterday.

5. I don't feel as tired as I did yesterday.

6. Our neighbours haven't lived here as long as us.

7. I wasn't as nervous as I usually am .

1.A   2.A   3.C  4.B  5.A  6.D  7.B  8.D  9.D  10.B  11.B  12.B  13.B  14.C  15.A  16.C  17.B  18.D  19.C  20.A

b, a//b (phần a)

\(AB\cap a\) tại A

\(AB\cap b\) tại B

Nên B₄ và Â₁ là 2 góc trong cùng phía

 \(\Rightarrow\)  B₄ + Â₁ = 180⁰

TS: B₄ + 60⁰ =180⁰

      B₄            = 180⁰ - 60⁰

       B₄              = 120⁰

1C  2D  3D  4D 5B  6A