Mike has already put forward his suggestion ____ a production plan should be completed next week.
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The news has spread all over the country ____ the spaceship succeeded in returning to the earth。
The first textbook ______ for teaching English as a foreign language came out in the 16th century.
I didn’t know your mobile phone number; otherwise I ____ you the moment I got to Washington。
As they are retired, Mr. and Mrs. Scott prefer a hours in the country to ____ their remaining years there