短文改错
此题要求改正短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边的横线上画一个勾（√）；如有错误（每一行只有一个错误），则按下列情况改正：此行多一个词：将多余的词用斜线（\）划掉，在该行右边的横线上写出该词，并也用斜线划掉。此行缺一个词：在缺词处加一个漏词符号（∧），在该行右边的横线上写出该加的词。此行错一个词：在错词下划一横线，在该行右边的横线上写出改正后的词。
注意：原行没有错误的不要改动。
Attention, please, everyone．We′ve accepted the                      39．______
weather forecast on the radio this morning that                                40．______
there will have a heavy rain tonight．Be sure                                 41．______
to shut the windows and doors until you leave 　                                   42．______
your classrooms．The sports meet when we planned to 　　               43．______
hold it tomorrow will be put off．After it becomes 　　　                       44．______
fine, we’ll make other announcement．We will 　　　　　　                45．______
have classes on Wednesday as usually．Since it is 　　                      46．______
colder tomorrow, please dress on more clothes in time．　        47．______
Those come to school by bike, don′t keep your 　　　　　                48．______
umbrellas open while riding．