6A, Rev. U1-U2
They _________________ in the ocean for 1 hour. (swim)
They've been swimming in the ocean for 1 hour.
Why don't we bring ______ with us? Good idea. I'll go get ____.
binoculars / them
This model airplane is really nice. I can't believe _____ ______ it by _____. (them/build))
I can't believe they built it by themselves.