Q1.
The marketing team is working hard to ______ customer satisfaction this quarter.
A. improve
B. improvement
C. improving
D. improved
Q2.
Ms. Tanaka was promoted ______ her outstanding performance.
A. because
B. because of
C. although
D. despite
Q3.
All employees must submit their expense reports ______ Friday afternoon.
A. until
B. by
C. during
D. from
Q4.
The new software is much more user-friendly than the one ______ last year.
A. develop
B. developing
C. developed
D. develops
Q5.
We regret to inform you that the meeting has been ______ until further notice.
A. delayed
B. delay
C. delaying
D. delays
Q6.
The report was completed quickly, ______ it contained several errors.
A. because
B. so
C. although
D. therefore
Q7.
Mr. Lee is responsible for ______ the training sessions for new staff.
A. organize
B. organized
C. organizing
D. organization
Q8.
The conference room is not large enough to ______ all the participants.
A. include
B. involve
C. consist
D. contain
Q9.
Customers are encouraged to contact our support team if they have any ______.
A. difficulties
B. difficult
C. difficulty
D. difficultly
Q10.
The company plans to expand its business ______ Asia next year.
A. at
B. to
C. in
D. on
✅ Answers & 詳しい解説（目安スコア付き）
Q1 → A. improve
🎯 目安スコア：500点
👉 to + 動詞の原形。名詞 improvement は不可。
Q2 → B. because of
🎯 目安スコア：600点
👉 後ろが名詞句（her outstanding performance）。
Q3 → B. by
🎯 目安スコア：550点
👉 締切＝ by + 時間 が鉄板。
Q4 → C. developed
🎯 目安スコア：650点
👉 「去年開発されたソフト」＝過去分詞の形容詞用法。
Q5 → A. delayed
🎯 目安スコア：500点
👉 has been + 過去分詞＝受動態。
Q6 → C. although
🎯 目安スコア：700点
👉 「速く完成したが、ミスがあった」＝逆接。
Q7 → C. organizing
🎯 目安スコア：550点
👉 be responsible for + 動名詞。
Q8 → D. contain
🎯 目安スコア：700点
👉 人数・容量を「収容する」＝ contain。
Q9 → A. difficulties
🎯 目安スコア：600点
👉 any + 複数名詞 が自然。
Q10 → C. in
🎯 目安スコア：500点
👉 地域・国・大陸＝ in。
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