Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks from 33 to 37.

         Some time ago, scientists began experiments to find out (33)______ it would be possible to set up a “village” under the sea. A special room was built and lowered (34)______ the water of Port Sudan in the Red Sea. For 29 days, five men lived at a depth of 40 feet. At a (35)______ lower level, another two divers stayed for a week in a smaller “house”. On returning to the surface, the men said that they had experienced no difficulty in breathing and had (36)______ many interesting scientific observations. The captain of the party, Commander Cousteau, spoke of the possibility of (37)______ the seabed. He said that some permanent stations were to be set up under the sea, and some undersea farms would provide food for the growing population of the world.

Điền vào số (33)