________, I could not memorize the text.

   A. However hard did I try                             B. However hard I tried

   C. However I tried hard                               D. However I had tried hard   

 Raising environmental awareness was the aim of our art exhibition ____ last week.

   A. to hold           B. held         C. having held          D. being held

 _________ he was, he still went on with his work.

   A. Tired although                  B. Tiring as          C. Tired though         D. While tired  

 It was the training ________ he had as a young man ________ made him so excellent.

   A. what; that                      B. that; which      C. that; what         D. which; that  

 Not until she took off her dark glasses ________ she was a famous film star.

   A. I realised                      B. that did I realise C. did I realise        D. that I realised  

 It is ten years since we ________ each other last time.  

   A. see           B. have seen                        C. saw             D. had seen  

 More wild tigers have been seen in the forest around this area, ________ there used to be very few.

   A. when           B. where                            C. what           D. which  

 It is usually warm in my hometown in March, but it ________ be rather cold sometimes.

   A. must           B. can          C. should             D. would  

 You can never be ________ when crossing the street. 

   A. very careful                    B. too careful        C. carefully enough     D. enough careful

 ________, you need to give all you have and try your best.   

   A. Being a winner                  B. To be a winner C. Be a winner     D. Having been a winner