[填句补文]The weather of the Caribbean Sea is almost always warm and sunny.Sandy beaches line the coasts of many islands. ________. Many tourists arrive on cruise ships.
A、They are Cuba，Puerto Rico，Jamaica，and Hispaniola.
B、The Caribbean Islands are known by several names.
C、Some of these islands are no more than tiny slivers(小片)of exposed coral.
D、This is why millions of tourists visit the islands each year.
[填句补文]More and more Americans are living alone. Some live alone because of divorce or the death of a partner. ________. According to a recent U.S. census (人口普查)， 25 percent of all households in the U.S. are made up of just one person.
A、It seems that many grown-ups today are realizing that childhood dream.
B、He says， “I like being by myself.”
C、However， even more people are living alone because they have chosen to.
D、There‘s more pressure to get married nowadays.