Difficulties and hardships have ________ the best character of the young geologist.
When I opened the door, I found my father sitting in his chair, completely ______ in the humorous stories he was reading.
______ 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.