___________ certain that his invertion will lead to the development of production.
| A．That’s | B．This is | C．It’s | D．What’s |
Alice was not satisfied with the apples her mother had picked for her, _______ was small and not ripe.
| A．some of them | B．some of which |
| C．one of them | D．one of which |
Whenever our friends come to see us, my parents will take them to the Shuihui Park and the Dinghui Temple, ______Rugao is famous in the country.
| A．which | B．that |
| C．for which | D．for that |
Witnessing the explosion(爆炸) in a chemical plant in Kunshan is the most frightening experience ______ I have ever had.
| A．that | B．when | C．which | D．who |
--- Is this company ______ your elder sister once worked in?
---- Yes, it is.
| A．where | B．which | C．the one | D．that |
---What are you reading, Dad?
--- I’m not really reading, just ______ the pages.
| A．turning over | B．turning around |
| C．turning on | D．turning up |