Ladies and gentlemen, please fasten your seat belts. The plane _____.
| A．takes off | B．is taking off | C．has taken off | D．took off |
The police say radio signals were probably used to set the bomb __________.
| A．about | B．down | C．off | D．out |
--- John went to the hospital alone.
--- If he _______ me about it, I would have gone with him.
| A．should tell | B．tells |
| C．told | D．had told |
Please read the ________ on the bottle and take the right amount of medicine.
| A．explanations | B．descriptions |
| C．instructions | D．introductions |
They did not sell a single car for a month and had to ________ some workers.
| A．lay out | B．lay up |
| C．lay off | D．lay down |
I don’t think I will need any money but I will bring some _______.
| A．at last | B．in case |
| C．once again | D．in time |