—I hear you have an experience in the Royal Air Force. Is that ture?—Yes. I ______ in the Royal Air Force for six years. A. served B had served C joined D have joined
I’d like to go straight to help people, ________ when they are in trouble.
My plane _________ at 8:30 am, so I _________ home early tomorrow morning.
Sorry, sir. I broke the window glass, but I didn’t do that ______.
_______ from space, we can find 70% of the surface of the earth _______ by water.
I really whether we win or lose.