1 B) Invent
2 D) equipment
3 B) discover
4 C) software
5 A) research
6 B) operating
7 D) complicated
8 D) lack
9 B) in
10 A) decrease
1 B) Invent
2 D) equipment
3 B) discover
4 C) software
5 A) research
6 B) operating
7 D) complicated
8 D) lack
9 B) in
10 A) decrease