The police ordered people to leave the building ______ a bomb threat.
"a bomb threat" là một cụm danh từ, cho nên chỉ đáp án B là phù hợp. Vì because of + (cụm) danh từ.
Since , because, in case đều theo sau là một mệnh đề.
_______ has been a topic of continual geological research.
The examination was not very difficult, but it was_____________________ long.
There has been a great increase in retail sales,_____________________ ?
The word "allocated" in the passage mostly means "______".
Tom: "___________________ " Mike: "I won't say no!"
We all agree that she is____________________ student in our class.
In spite of her abilities, Laura has been_____________________ overlooked for promotion.
______ his brother, Mike is active and friendly.
We must push the piano to the corner of the hall to_____________________ our party tonight.
The phrase "keeps sellers on their toes" in the passage mostly means "______".