Choose the word that best fits the blank space in the following passage *Paragraph 1: Dolphins are known as marine (1) ______they breathe air, they are warm-blood, and they bear live young ones called calves. The size of dolphin is very greatly. (2)______ smallest dolphins are just about 50 kg in weight and 1.2 meters in length while the largest one can weigh up to 8.200 kg and is 10 meters long. Dolphins are sociable creatures. They swim together in group known as herds. They show great ability in the water. Dolphins are interested (3) ______humans and often rescue people in the sea who are in danger. They are intelligent creatures and make sounds to (4)_____ with each other. Scientists have studied dolphins for many years and are now looking into the possibility of dolphins that are able to carry (5) _____ tasks under the sea. 1. A. fish B. creatures C. mammals D. life 2. A. A B. An C. The D. And 3. A. in B. at C. on D. of 4. A. talk B. communicate C. contact D. connect 5. A. out B. in C. of D. with