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.

The oceans support many different kinds of marine life that cannot live on land. We are ________ with some of them, such as sea turtles, whales and seals, but many other life forms in the oceans cannot be seen with the naked eye.

① similar

② familiar

③ concerned

④ related

⑤ aware

2.

Sadly, __________, the health of our oceans is in a serious state. Beaches are closed due to disease-causing bacteria. Fishermen are losing their fisheries. And the loss of wetlands may lead to damage of ecosystems. Water pollution, population growth, and coastal development endanger marine life and, directly or indirectly, our own lives as well.

① likewise

② however

③ moreover

④ besides

⑤ rather