Q1.
The revised schedule will be announced ______ the end of this week.
A. at
B. by
C. until
D. during
Q2.
Ms. Roberts handled the client’s complaint ______ and efficiently.
A. professional
B. profession
C. professionally
D. professionalism
Q3.
All visitors must sign in at the reception desk ______ entering the building.
A. after
B. before
C. while
D. since
Q4.
The company decided to delay the product launch ______ unexpected technical issues.
A. because
B. although
C. due to
D. unless
Q5.
Please ensure that all documents are properly ______ before submission.
A. complete
B. completed
C. completing
D. completion
Q6.
The new policy is intended to ______ employee satisfaction.
A. improvement
B. improving
C. improved
D. improve
Q7.
Mr. Chen has been in charge of the sales department ______ 2019.
A. for
B. during
C. since
D. from
Q8.
The conference room was unavailable ______ it was being used for a training session.
A. although
B. because
C. unless
D. while
Q9.
Employees are asked to keep all customer information ______.
A. confidence
B. confidential
C. confidentially
D. confide
Q10.
The software update allows users to work more ______ than before.
A. efficient
B. efficiency
C. efficiently
D. efficienting
✅ Answers・詳しい解説・目安スコア
Q1 → B
🎯 目安スコア：550点
◆ 解説
by the end of 〜 = 〜までに。
期限表現の定番。
Q2 → C
🎯 目安スコア：600点
◆ 解説
動詞 handled を修飾 → 副詞 professionally。
Q3 → B
🎯 目安スコア：550点
◆ 解説
建物に入る「前に」サインイン。
before が自然。
Q4 → C
🎯 目安スコア：600点
◆ 解説
due to + 名詞句。
unexpected technical issues は名詞。
Q5 → B
🎯 目安スコア：550点
◆ 解説
be + 過去分詞
「書類が完成された状態」。
Q6 → D
🎯 目安スコア：600点
◆ 解説
intend to + 動詞原形。
Part5頻出構文。
Q7 → C
🎯 目安スコア：550点
◆ 解説
since + 起点（2019）。
for は期間。
Q8 → B
🎯 目安スコア：600点
◆ 解説
理由を述べている → because。
Q9 → B
🎯 目安スコア：500点
◆ 解説
keep + 形容詞
confidential information は鉄板表現。
Q10 → C
🎯 目安スコア：600点
◆ 解説
work（動詞）を修飾 → 副詞 efficiently。
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