--- I'm sure Andrew will win the first prize in the final.
--- I think so. Hefor it for months.
| A． | is preparing | B． | was preparing |
| C． | had been preparing | D． | has been preparing |
It doesn't matter ________ you pay by cash or credit card in this store.(2012·山东 )
| A．how | B．whether | C．what | D．why |
Believe it or not，I'm sure that is ________ people call the six sense.
| A．when | B．what | C．which | D．why |
________ several times，but he still doesn't know how to do it correctly.
| A．Although I've taught him |
| B．I've taught him |
| C．Having been taught |
| D．Having taught |
Information technology is taught in most schools，________ we have entered the information era.
| A．so | B．while |
| C．for | D．still |
It's really very dangerous.One more step，________ the baby will fall into the well.
| A．or | B．so | C．but | D．and |