english exercise (20 points)

Ex.3
3.in
5.on
8.at
9.On
11.by
15.by

Ex.4
1.for
2.with
3.with
4.by
5.of
6.by
7.of
8.for
9.about
11.of
12.for
13.with
14.about

Ex.5
1.for
2.by
3.at
4.for
5.to
6.at
7.on
8.over
9.in
10.for
11.at
12.by
13.on
14.at
15.about
16.for
18.to
19.for
20.In