1．用base/basis填空
(1)The most difficult problem that confronts an industrial ________ is how to avoid the danger of environmental pollution.
(2)The main ________ of this drink is orange juice.
(3)What’s the ________ for your opinion?
2．用signal/sign/mark/symbol的适当形式填空
(1)They had ignored the ________ of the approaching earthquake.
(2)The sauce has left a ________ on his shirt.
(3)At an agreed ________ they left the room.
(4)“Fe” is the ________ for iron.
(5)There is no ________ of life in outer space.
3．用add/add to/add...to.../add up/add up to的适当形式填空
(1)Your carelessness ______________ our difficulty.
(2)The money he spent ________________________ no more than ￡1,000.
(3)Every time I ________________ these figures I got a different answer.
(4)I’d like tea with sugar ________________.
(5)“And I quite agree，” he ________.
4．用no more (...) than/not more (...) than填空
(1)I got as much as pay，if __________________ you.
(2)I could do it ________________________ you.You’d better ask Jim.He is good at it.
(3)The whale is ________________ a fish ________ the dog is.
