1.The Air force is an important _______ of national defense.
A. company
B. component
C. consist
D. comment
2. The project team _______ of ten members under my leadership.
A. insists
B. persists
C. consists
D. assists
3.He is a young man of great _______. I believe he will be successful in the future.
A. potential
B. expectation
C. possibility
D. popularity
4. When I started learning English, I focused _______ remembering lots of vocabulary.
A. on
B. to
C. in
D. for