—I _____ thank you enough for what you have done for me.
—You’re welcome.
| A．may not | B．will not | C．must not | D．can not |
Many people agree that ________ knowledge of English is a must in ________ international trade today.
| A．the；an | B．a；/ | C．the；the | D．/；the |
In the market，vegetables are sold by ________ kilogram，I mean，by ________ weight.
| A．the；/ | B．/；/ | C．the；the | D．/；the |
—John has put forward ________ most challenging question for us to answer.
—Yes，it really is.I have never heard ________ harder one.
| A．the；/ | B．/；the | C．the；the | D．a；a |
The education of ________ young is always ________ hot and serious topic.
| A．/；/ | B．the；a | C．/；the | D．the；/ |
As ________ unemployment is very high at the moment，it's very difficult for people to find ________ work.
| A．the；/ | B．/；/ | C．the；a | D．an；the |