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The twelve animal- head statues are _______ ,for they are our national art treasures.

A. valueless       B. invaluable    C. worthless  D. Useful

Solar energy heating system is an _____ method of heating.

 A. economic      B. economy       C. economics      D. economical

 Those who are of great determination are ________ to make great achievements.

   A. maybe           B. likely             C. probable          D. possible

Follow your doctor’s advice, ______ your cough will get worse.

A. or              B. and           C. then         D. so

________ I call on him, he is out.

A. The moment               B. So far as    

C. Every time                      D. Any time

When Captain Bligh arrived in Tahiti, it became clear that it would be some months ______ the breadfruit trees were ripe and ready to be taken to the West Indies.

 A. that                        B. before           C. since         D. then

For holidays, many people visit those islands ________ the coast of Australia.

A. in       B. on               C. off   D. of

 __________ all my homework unfinished, I am not allowed to go online to play games.

A. To            B. For                 C. With                 D. Without

The giant wrestled _____ him blindness, wandering aimlessly ____ his lost animals.

  A. over; in search of              B. with; in search of 

C. about ; in one’s search for        D. with; in one’s search of

________ what I had originally thought, collecting stamps turned out to be fun.

  A. In spite of         B. Instead of         C. Because of        D. Contrary to