It is these poisonous products _____can cause the symptoms of the flu, such as headache and aching muscles. [ ]

When he learned that his brother had returned from abroad, he set off to his home _____ Which of the following is not OK? [ ]

I hspare any time．for I_____an essaythat is due this morning．

Though my grandfather is in his eighties, he is still as _________ as a young man and hates sitting around doing nothing all day.

You don’t need to teach ___________ how to cook and sew. I can teach ___________.