Thank you,your answers help me a lot.
I have one more exercise with the missing words, when you have a time, please check it.I write my answers in the brackets.
1.All I want is__ alone. (to stay home)
2.By 2020, we__ here for 14 years. (would have been living)
3.Do you know the reason __ she's changed her mind? (why)
4. Two men,__ I had ever seen before.. (neither of them)
5. What we'll do is __ a note for Mum to tell her we won't be back till late. ( to write)
6.It's time some changes __ . (to be made)
7.Should anyone arrive late,admission is likely __ . (to be refused)
8.He __ earlier,but the answer machine was broke. (left the message)
9. If Kevin was out all day, Then it makes sense he __ answer the phone. (couldn't)
10. I wish you __ complaining all the time. (would stop)