It is said that the old coins ______ under the earth for about 100years by the time they were discovered

r frequently, the works of Shakespeare always attract many people.

_________ is said that most teenagers haveproblems such as Li Ming’s.

___ with a gradual rise of seawater, some nations in the Pacific are considering moving in the near future[ ]

下列各句中，划线的词使用恰当的一句是（ ）