_____ the police thought he was the most likely one, since they had no exact proof about it,they had to set him free.
______ money, his parents couldn’t send him to university.
It’s very dangerous to _______ these viruses without any protection.
My father is always strict _______ me, so he was very angry _______ my fault on this matter.
--Would you mind if I opened the window? -- ________. In fact, I was going to suggest you _______ it.
It’s _______ thrill to have ______ ten-year research project completed with the desired result.