I don’t think that your lecture _______ the audience, for they appeared quite puzzled.
Our school_____ the 50th anniversary of the founding of CCFLS on October 5th, 2013.
When the telephone rang, I happened_____ a book.
The boy wanted to ride his bicycle in the street, but his mother told him_____.
Please put on the coat, _____ you’ll catch a cold.
Try to_____ at least an hour each day for learning English and you’ll make progress.