A、BoAts wErE ExtrEmEly CrowDED thEn.
B、thE CurrEnt wAs too swiFt For BoAts to Cross EAsily.
C．BriDgEs wErE too wEAk to CArry thE wEight oF A CArriAgE.
D．FErry sErviCE wAs inFrEquEnt.