It was not until 1920 ______ regular radio broadcasts began.
| A．while | B．which | C．that | D．since |
I was disappointed with the film . I had expected ______ to be much better.
| A．that | B．this | C．one | D．it |
It was not _____ she took off her glasses _____ I realized she was a famous film star.
| A．when , that | B．until , that | C．until , that | D．when , then |
Does ______ matter if he can’t finish the job on time?
| A．this | B．that | C．he | D．it |
I don’t think ____ possible to master a foreign language without much memory work.
| A．this | B．that | C．its | D．it |