The dancer might have been killed in the crash if she ___ (go) to American by plane.
How many children under four drown each year in the United States？
__________.
Do the results of the research have any practical (apply) ________？
根据以下资料回答1～5题
第1题____
How will the hours of operation be altered during holiday periods？
It may _________.
In the second half of the 19th century many great inventions were made.
B)在十九世纪下半叶，有了很多重大发明。
C)在十九世纪下半叶，人们制造了很多重要的东西。
D)在十九世纪晚期，有了很多重大发明。