____ with any common sense can tell the difference between the two．
| A．Who | B．Whoever | C．Anyone | D．That |
Evdence has been found through years of studychildren’s early sleeping problem are likely to continue when they grow up.
| A．why | B．how | C．whether | D．that |
The headmaster will not permit the change in the course, norit a thought.
| A．does he even given | B．he even gives | C．will he even give | D．he will even given |
It was 80 years before Christopher Columbus crossed the AtlanticZheng He sailed to East Africa
| A．when | B．that | C．after | D．since |
Before you quit your job, how your family would feel about your decision.
| A．consider | B．considering | C．to consider | D．considered |
All the photographs in this book,stated otherwise, date from the 1950s.
| A． | unless | B． | until | C． | once | D． | if |