Teenagers should be encouraged to go ______and be close to nature.
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.
---Have you ever watched You who came from the star?---________. I plan to watch it on the Internet this Sunday.
Mary had few close friends. So she didn’t know ________ about the problems.