—I’m not sure ______there are living things on other planets or not .—Even scientists aren’t sure about it.
Please listen to the teacher carefully. Don't ______ the window.
In the United States, Father’s Day falls on _______ third Sunday in _________ June.
--I’m going to have a trip to Window of the World. ---_________.
The little girl is _______nervous _______talk in front of the class.
Anyway, Jack knows _______ help about travelling .