Tính các giới hạn sau:  lim x → 6   =   x + 3   -   3 x   -   6

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

I’m afraid I’m getting cold feet about this scheme as I’m not sure it’s such a good idea.

A. happy about    

B. worried about   

C. calm about       

D. confident of