It is not rare in _______ that people at the age of forty are going to _________university for further education.
| A．90s; the | B．the 90s ; / | C．90s; a | D．the 90s; the |
Two big guns are fired, and it is the __________ for the celebrations to begin.
| A．mark | B．sign |
| C．signal | D．symbol |
The red light is a __________ of stopping the cars.
| A．sign | B．signal |
| C．mark | D．symbol |
They have read the paper many times, but it doesn't make any __________.
| A．sense | B．value |
| C．mark | D．symbol |
He's got himself into a dangerous situation __________ he is likely to lose control over the plane.
| A．where | B．which |
| C．while | D．why |
It's helpful to put children in a situation __________ they can see themselves differently.
| A．that | B．when |
| C．which | D．where |