When you meet some trouble about how to use this new kind of machine, you can the instruction.
The result of the experiment was very good, ______ we hadn’t expected.
Please tell me the way you thought of ______ the garden.
Passengers are required to _____ seated until the plane comes to a complete stop.
I know there is a coin in your left hand, but what’s in your _______ hand?
--- Will you go to the exhibition with me? --- If you don’t, ____________.