When I said someone broke the school regulations, I ______ you. Why did you get that angry?
| A．don’t refer to | B．haven’t referred to | C．wasn’t referring to | D．hadn’t referred to |
—The plane is due to take off at 7:50 from the airport. ______ we fail to arrive there in time?
—Try to take another flight then.
| A．As if | B．Even if | C．Only if | D．What if |
Our teachers often encourage us that every minute we spend on studying will finally _______ in the near future.
| A．run out | B．go off | C．come out | D．pay off |
Fever _______ sickness. You should see a doctor at once.
| A．explains | B．informs |
| C．introduces | D．indicates |
Not all the patents________ have been recognized.
| A．to be examined | B．being examined |
| C．examined | D．having been examined |
Unless______, this law will make life difficult for farmers.
| A．changed | B．changing |
| C．being changed | D．is changing |