56 how

57 used

58 they

7 B at first hand : trực tiếp

8 A (dich nghĩa)

9 D make way for : nhường chỗ cho

10 C

11 D

12 A

13 B

Chọn C

15 D (relieved : an tâm)

17 B (however + tính từ)

 He is widely regarded as the best man for the job.

 The suspect could not account for the sand in his boots 

sally came up with the best solution.

 You need to make allowances for the fact that he hasn't spoken French for years.

 It was inevitable that he would fail his exams. 

\(\widehat{ACB}=180^0-\left(\widehat{BAC}+\widehat{ABC}\right)=50^0\)

\(\Rightarrow\widehat{AOB}=2.\widehat{ACB}=100^0\) (góc ở tâm gấp đôi góc nội tiếp chắn cùng dây cung)