—Is the letter from your mother?
—Yes. But she ________ the letter herself, because she doesn't even know one word.
| A．needn't have written | B．can't have written |
| C．might not have written | D．should not have written |
Tell me when you ______ at the airport, Alice. I’ll go there to meet you if I’m free.
| A．arrive | B．would arrive |
| C．have arrived | D．are arriving |
Great changes have taken place in the city ______.
| A．in that she grew up |
| B．she grew up |
| C．in which she grew up |
| D．which she grew up |
It was the second time that we ______ in holding such important parties.
| A．had succeeded | B．succeed |
| C．succeeded | D．have succeeded |
She opened her eyes and was about to cry out ______ she heard her father urgently telling her to keep quiet.
| A．when | B．while | C．before | D．after |
Let children speak their own opinions, ______they are different from your own.
| A．until | B．unless | C．as though | D．even if |