1 D => astronomy
2 C => park
3 D => on
4 C => these
5 B => because of
6 B => takes
7 B => borrow
8 D => the time of the meeting
9 D => efficiently
10 C => themselves
11 A => because
12 B => asking
13 B => the
14 C => the
15 D => the
17 C => one of the
18 A => the
19 D => a
20 D => television