--- What’s up with Maria? She looks upset.
--- A call from her mother ________ the attack of homesickness.
| A．set out | B．set about | C．set off | D．sent off |
76..I don’t think ____ possible to master a foreign language without much memory work.
| A．this | B．that | C．its | D．it |
77.Does ______ matter if he can’t finish the job on time?
| A．this | B．that | C．he | D．it |
78.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 |
79.I was disappointed with the film . I had expected ______ to be much better.
| A．that | B．this | C．one | D．it |
80.It was not until 1920 ______ regular radio broadcasts began.
| A．while | B．which | C．that | D．since |