Last month, part of Southeast Asia was struck by floods, from whose_______ the people are still suffering．
| A．affect | B．effects | C．affection | D．efficiency |
______ with care, one tin will last for six weeks.
| A．Use | B．Using | C．Used | D．To use |
When deeply absorbed in work,he often was, he would forget all about eating or sleeping.
| A． | that | B． | which | C． | where | D． | when |
George said that he would come to school to see me the next day, but he.
| A． | wouldn't | B． | didn't | C． | hasn't | D． | hadn't |
Jerry did not regret giving the comment but felt ______ he could have expressed it differently.
| A．why | B．how | C．that | D．whether |
One learns a knowledge by making mistakes and ______ them.
| A．corrects | B．correct | C．to correct | D．correcting |