I don’t know______. — Because he has to look after his mother.

As China grows stronger and stronger, Chinese _____ in more and more schools out of our country.

It doesn’t _____ to set off fireworks on holidays since the smog(雾霾) is so severe at present.

If I find someone who looks like the suspect，my ________ reaction will be to tell the police.[ ]

Strong sandstorms are often _____ you cannot see the sun