1.
The manager asked the team to finish the project _____ the end of the week.
A. by
B. until
C. during
D. between
2.
The new software is much easier to use _____ the previous version.
A. as
B. than
C. from
D. for
3.
Please make sure all equipment is turned off before you _____ the office.
A. will leave
B. leaving
C. leave
D. to leave
4.
The company is planning to expand its service area next year, _____ will require additional staff.
A. who
B. which
C. where
D. that
5.
All employees are encouraged to submit suggestions that may help _____ workplace efficiency.
A. improve
B. improving
C. improved
D. to improving
6.
The report was completed later than we had originally _____.
A. expect
B. expects
C. expected
D. expecting
7.
Mr. Park has been working here _____ more than ten years.
A. for
B. since
C. during
D. about
8.
The CEO will visit our branch next week to discuss the _____ product launch.
A. coming
B. came
C. comes
D. come
9.
We apologize for the delay, which was caused by unexpected system _____.
A. fail
B. failure
C. failing
D. failures
10.
The marketing team decided to increase the budget _____ the campaign reaches more customers.
A. so that
B. because
C. unless
D. although
✅ 【解答 & 詳しい解説】
1. 正解：A（600点）
“by the end of〜”＝「〜の終わりまでに（締め切り）」
until は「〜までずっと続く」で不適。
2. 正解：B（600点）
比較級 “easier than〜” の形が必須。
3. 正解：C（650点）
時・条件の副詞節 → 未来のことでも 現在形（leave） を使う。
4. 正解：B（700点）
先行詞は「service area（物）」→ which が自然。
5. 正解：A（650点）
help の後は 動詞の原形（help improve）が一般的。
6. 正解：C（700点）
had originally expected = 過去完了。
Part 5でよく出るパターン。
7. 正解：A（600点）
期間を表すときは for + 時間。
since は「〜から（起点）」。
8. 正解：A（600〜650点）
coming =「今後の、近々の」。
形容詞的に product を修飾。
9. 正解：B（650点）
system failure = 固いビジネス英語のコロケーション。
10. 正解：A（700点）
so that =「〜するために」。
目的を表す接続詞。
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