It is never clear _____ the man hadn’t reported the accident sooner.
| A．that | B．how | C．when | D．why |
When（）for his views about his teaching job, Philip said he found it very interesting and rewarding.
| A． | asking | B． | asked | C． | having asked | D． | to be asked |
Ａlot 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 |
The athlete’s years of hard trainingwhen she finally won the Olympic gold medal.
| A．went on | B．got through | C．paid off | D．ended up |
The limits of a person's intelligence, generally speaking, are fixed at birth, buthe reaches these limits will depend on his environment.
| A． | where | B． | whether | C． | that | D． | why |
In order to find the missing child, villagersall they can over the past five hours.
| A．did | B．do | C．had done | D．have been doing |