1.False
2.False
3.False
4.True
5.True
1 alone
2 on
3 of
4 in /of
5in
6 in
7at
8 at/-
9-
10 in
2 became
3 didn't buy
4did she learn
5 wanted
6did he go
7left
8didn't marry
9studied
10did you do
11 didn't move
It is difficult to be a parent.
It is dangerous to swim along if you can't swim.
It is impossible to breath under the water.
It is stupid to sing in midnight.
It is boring sitting along all day.