Tom________tell the truth to his boss because he didn't want to make trouble.
| A．daren't to | B．dare to | C．dared not | D．dare |
There is no simple answer，__________ is often the case in science.
| A．as | B．that |
| C．when | D．where |
He may win the competition，__________ he is likely to get into the national team.
| A．in which case | B．in that case |
| C．in what case | D．in whose case |
Whenever I met her，__________ was fairly often, she greeted me with a sweet smile.
| A．who | B．which |
| C．when | D．that |
By 16:30，__________ was almost closing time, nearly all the paintings had been sold.
| A．which | B．when |
| C．what | D．that |
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 |