It’s very dangerous to _______ these viruses without any protection.
It is ________ challenge for graduates to get ________ job as unemployment is high nowadays.
—I'm sorry I've spilt some tea on the tablecloth. —________;it will wash out.
I am so tired,for I ________ English for 2 hours.
—Shall we go out to the seaside this weekend? —________ Ring me up at any time.
It was Tom ________ is a soldier ________ saved the little girl from the water yesterday.