—_____ do you go to the zoo with your brother?—Three times a month.
---I’m always afraid of giving a speech in front of the class. ---You can do it well.
I haven’t decided _________ these books yet.
Nobody except Tom and Millie ____ that park before. Only they can be our guides.
---When will the plane ___________? --- In an hour.
The twins look the same, but they are really different.