Exercise 42.2:
1, C -> major barrier
2, d -> large enough
3, D -> greatly reduced
4, C -> in which
5, D -> it is
6, B -> it possible
7, C-> each second
8, B -> was bombarded
9, A -> slow moving
10, A -> such as
11, C -> light is
12, B -> highly original
13, B -> only one
14, D -> feet long
15, C -> is surrounded
16, B -> workers’ satisfaction
17, B -> which is now
