Q1.

The final proposal will be reviewed ______ the board members next Friday.
A. by
B. from
C. into
D. around

Q2.

The new software update is expected to significantly ______ processing speed.
A. improve
B. improved
C. improvement
D. improving

Q3.

All employees must submit their monthly reports ______ the first business day of each month.
A. at
B. before
C. during
D. under

Q4.

Mr. Jensen was promoted to team leader ______ his outstanding performance last quarter.
A. because
B. although
C. because of
D. unless

Q5.

The customer service team is currently working on a plan ______ customer satisfaction results next year.
A. to increasing
B. increase
C. to increase
D. increased

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✅ Answers・目安スコア・詳しい解説

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Q1 → A（by）

目安：500–600点

◆ 解説

“reviewed by the board members”
→ 受動態の “by＝〜によって” が入るのが自然。
TOEICで超頻出のパターン。

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Q2 → A（improve）

目安：600–650点

◆ 解説

“expected to + 動詞の原形”
→ “is expected to improve” が正しい形。

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Q3 → B（before）

目安：500–600点

◆ 解説

“〇〇までに提出する”＝ before が鉄板。
“at the first business day” は不自然。

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Q4 → C（because of）

目安：550–650点

◆ 解説

“because of + 名詞”
→ “because of his outstanding performance” が正しい。
“because” は後ろに文が来るため ×。

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Q5 → C（to increase）

目安：500–600点

◆ 解説

plan + to + 動詞の原形（〜する計画）
→ “a plan to increase customer satisfaction”。