✨ Jawaban Terbaik ✨
(A) …, it is possible to establish a settlement on any planet within 100 years.
※形式主語構文:it<形式主語>-to establish(不定詞) a settlement … 100 years<真主語>
100年以内に → within 100 years
(B) One reason(S1) <why they wouldn't take action> is(V1) <that(接続詞) they(S2) are(V2) quite uncertain(C2) about their own and their family's future>(C1).
※be uncertain about … …について確信がない、…の先が見えない
参考にしてください。
You're welcome!😊
ありがとうございます