______ is know to us all, good friends ______ happiness and value to our life.
| A．It; add | B．As; add up | C．It; add up | D．As; add |
theater
| A．pleasant | B．breathe | C．really | D．deaf |
island
| A．surprise | B．machine | C． invite | D．children |
The sight of the big cake on the table suddenly _________ me that it is my birthday today.
| A．remembers | B．impresses |
| C．confirms | D．reminds |
This produced a chain reaction, _______ made _______ possible for life to develop.
| A．what; that | B．which; it |
| C．when; that | D．how; it |
The thought they couldthe whole continent was exciting.
| A．that; cross | B．what; cross |
| C．whether; across | D．when; across |