We did not find __________ to prepare for the worst conditions we might face．

We must take a firm __________ against the lowering of ...

单项选择题We must take a firm __________ against the lowering of educational standards．

When he bent over to untie his shoelace，the __________ ...

单项选择题When he bent over to untie his shoelace，the __________ of his trousers split．