It will be years _______ all children can go to school free of charge at all
| A．since | B．after | C．as | D．before |
It is not who is right but what is right _____ is of importance.
| A．which | B．it | C．that | D．this |
I just wonder _____ that makes him so excited.
| A．why it does | B．what he does | C．how it is | D．what it is |
It was not until she got home ___ Jennifer realized she had lost her keys.
| A．when | B．that | C．where | D．before |
It was with great joy _____ he received the news that his lost daughter had been found.
| A．because | B．which | C．since | D．that |
It is these poisonous products_____can cause the symptoms of the flu , such as headache and aching muscles .
| A．who | B．that | C．how | D．what |