The wrong you’ve done him is terrible，________you should make an apology to him，I think.
| A．for whom | B．to which |
| C．for which | D．to whom |
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 |
Only three will be enough, so I needn’t take ______ of them.
| A．some |
| B．none |
| C．all |
| D．any |