The boy wanted to ride his bicycle in the street, but his mother told him_____.

Why not stay at home ______ the road is soslippery after the heavy snow

I don’t know how it ___________ that ourcar was bumped from behind.

You seem in low spirits. Anything wrong—– I ______ in the important exam. I let my parentsdown.

Even a mighty express train can be held up by signals. Which of the following words can be used to replace “held up”? [ ]