Barack Obama has taken personal blame ________ the security failures which led ________ the attempt to blow up a plane on Christmas Day.
| A．of; to | B．for; to | C．on; on | D．in; on |
. — At present we students have access to many valuable English websites to learn English.
— As far as I know, English on line.com is a free site ______ visitors can not only learn the English language but also chat on line.
| A．where | B．which | C．that | D．what |
— 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 |