He is very ______and he always explains things _____us.
This was his first visit ________ China.He said the trip ________ China was very interesting.
—Excuse me,look at the sign NO PHOTOS! —Sorry,I ________ it.
One of the popular expressions in 2012 ________ “Positive energy”.
Sam opened the door and ________ a lovely dog outside.
—________ you busy last Saturday? —Yes.I ________.