Comrade Li Dazhao, _____ librarian of Beijing University, was one of the founders of the Chinese Communist Party.
| A．sometimes | B．sometime | C．some time | D．some times |
His conclusion, ______ on careful research, was acceptable.
| A．to base | B．to be based | C．basing | D．based |
It was __________________ back home from work.
| A．not until midnight did he go | B．until midnight that he didn’t go |
| C．not until midnight that he went | D．until midnight when he didn’t go |
There is no reason why you shouldn’t tell the headmaster _________ that you are resigning because he has arranged your post.
| A．in effect | B．in fact | C．in advance | D．in support |
It was with great joy the couple found their missing son after 18 years.
| A．when | B．that | C．what | D．which |
What ______ the doctors most was that they could not find the cause of the disease.
| A．astonished | B．puzzled | C．surprised | D．amused |