Food shortage will long be a worldwide problem _______ much has been done to supply enough for everyone.
| A．before | B．if |
| C．since | D．although |
In our school, students are according to how much they know and how old they are.
| A．classified | B．combined | C．listed | D．made |
My uncle is a butcher, who is skilled atthe pork.
| A．cutting down | B．cutting up | C．cutting off | D．cutting out |
He thought himselfto his friends because his family was rich.
| A．higher | B．better | C．richer | D．superior |
It suddenlyto me that this was something that I should never do, so I turned down her request.
| A．happened | B．hit | C．struck | D．occurred |
—Have you finished your project, Alice?
—I’m afraid I forgot about it.
| A．naturally | B．probably | C．extremely | D．totally |