________ a child begins school, he enters a world of fierce competition where success and failure are clearly defined and measured.
| A．Before | B．Until | C．Whenever | D．The moment |
I failed again in the examination and only then _____ how much time I had wasted.
| A．I realized | B．I had realized | C．did I realize | D．had I realized |
-----Where did you find your wallet?
-----It was in the park _______ we went for a walk yesterday.
| A．where | B．that | C．how | D．Which |
________his dream of going to college will come true is uncertain.
| A．That | B．Whether | C．If | D．Even if |
The speech which he made ______ the football match bored a lot of fans to death.
| A．being concerned | B．be concerned | C．concerned | D．concerning |
The two ships came into ____ and 100 people were skilled.
| A．collision | B．confuse | C．combination | D．Contrary |