Fortunately, the hospital’s new air-conditioning system________ when the first heat wave of the summer arrived.

A. to work                

B. working           

C. being working    

D. to be work

A. having             

B. having had          

C. to have            

D. for having

B. aspect              

C. event                

D. affair

A. activity      

B. happy              

D. birthday

A. She started cooking for dinner two hours ago.

B. Cooking for dinner took her two hours.

C. She didn’t start cooking for dinner until it was two.

D. She has two hours to cook for dinner.

A. Because he is old, he can run far.       

B. He is too old to run so far

C. He is old enough to run far.                       

D. Although he is old, he can run far.