He found_ ________very difficult ________the math problem．
A．that, to solve B. this, solving
C. it, to solve D. it, solving
— What did Tina say? — Sorry, I didn’t ________ what she said.
A. pay attention to B. get on with
C. hold on to D. look forward to
—Do you know _____ ? I'm going to see him. —Sorry, I don't know.
A. where does Mr. Li live B. where did Mr. Li live
C. where Mr. Li lives D. where Mr. Li lived
I often make mistakes ___________ grammar..
A. by B. through C. across D. in
--- ________. Could you tell me the way to the station?
A. Pardon B. Excuse me
C. Sorry D. Ok
_______ dangerous the animals are！
A. What a B. What
C. How a D. How
