Only after a person has realized the importance of knowledge, ____________.
| A．he can devote himself to learn |
| B．he may devote himself to learning |
| C．can he devote himself to learn |
| D．can he devote himself to learning |
— Isn’t it amazing that I met my pen-friend Jim on May Day?
— Really? For how many years _______ each other?
| A．didn’t you see | B．haven’t you seen | C．hadn’t you seen | D．don’t you see |
Each boy and each girl as well as some teachers who ______ to participate the Marathon _______ required to be at the school gate at 2:30 pm..
| A．are; is | B．are; are | C．is; are | D．is; is |
. —You can’t imagine ____ fantastic fun web chatting is.
—Really? But it may cause a lot of trouble sometimes.
| A．what | B．how | C．why | D．so |
Bad luck! Our water supply _______ while we were making our way in the desert.
| A．used up | B．gave out | C．went off | D．turned over |
Elizabeth believed the dog would die if _____ to her cruel owners so she kept it.
| A．returning | B．was returned | C．it would return | D．returned |