13. John received an invitation to dinner, and with his work _________, he gladly accepted it.
| A．finished | B．finishing | C．having finished | D．was finished |
The prize will go to the writer ______ story shows the most imagination.
| A．that |
| B．which |
| C．whose |
| D．what |
A lot of language learning,______ has been discovered, is happening in the first year of life, so parents should talk much to their children during that period.
| A．as |
| B．it |
| C．which |
| D．this |
That evening, _____ I will tell you more about later, I ended up working very late.
| A．that |
| B．which |
| C．what |
| D．when |
He is trying to shelter his boss ______ criticism.
| A．from |
| B．off |
| C．to |
| D．out |
The scientist knew nothing about the matter, because he was always ______ himself in his study.
| A．burying |
| B．devoting |
| C．focusing |
| D．concentrating |