Ⅱ．从方框里选择合适的词组，并用其正确形式填空。
all over again, at a speed of, float off, in the form of, in some ways
【小题1】The iceberg (冰山) broke and pieces of ice ________ into the open sea.
【小题2】The trains from Nanjing to Hangzhou run ________ over 300 kph.
【小题3】Sound travels ________ sound waves (声波).
【小题4】British English is different from American English ___________.
【小题5】To avoid more mistakes, the task must be started ______________.