Once environmental damage ______, it takes many years for the system to recover.

Mike's father as well as his mother insisted that he __...

单项选择题Mike's father as well as his mother insisted that he ______ home.

Was it is 1969 ______ the American astronaut succeeded ...

单项选择题Was it is 1969 ______ the American astronaut succeeded ______ landing on the moon

Is this the restaurant ______A．which you workB．in which...

单项选择题Is this the restaurant ______