1.he was in the kitchen at that time.he was helping his mother（合并为一句）
he ______ in the kitchen ______his mother at that time
2.my sister was writing a letter,too（改为否定句）
my sister______ _____a leeter,______
3.the neighborhood was _(in a__mess)______after the storm(对括号内的内容提问）
_______ _______the neighborhood________after the storm
4.it was(dark and windy)before the heavy rain started(对括号内的内容提问）
________ _______ the weather________before the heavy rain started
在五分钟内