________ these experiments were successfully completed would we think of going into humans.
| A．If only | B．Only if | C．So that | D．Even if |
--- How many subjects are you good at?
--- Three, ______, English, Chinese and politics.
| A． namely | B． such as | C． for instance | D． like |
Chongqing is among the most important cities in China ______ its size and population.
| A． in favor of | B． in honor of | C． in view of | D． in terms of |
______ to their own work, most of the parents spend little time with their children.
| A． Devoting | B． To be devoted | C． Having devoted | D． Devoted |
What a pity! I ______ in Hainan two more days, but something urgent needed to be dealt with back home.
| A． must have stayed | B． needn’t have stayed |
| C． may have stayed | D． could have stayed |
Tom, Jack and Rose were named as assistant professors. Believe it or not, ______ three of them were of ______ age.
| A．不填; an | B．不填; the | C． the; an | D． the; the |