次の文の空棚に一番適当と思われる答を (A) (B) (C) (D) から選びなさい。
1. If we ------- Solar panels on our roof, we could save on our electricity bills.
(A) established
(B) installed
(C) included
(D) prepared A
2. Some people become vegetarians for ------- reasons, because they think
humans have no right to kill animals.
(A) practical
(B) scjentific
(C) ethical
(D)economic