42. Concrete has ___b__.

a. some kind of chemical that corrodes steel

b. an alkaline chemical reaction, the opposite of acid

c. some kind of acid

Passage Four

The employer or promoter of civil engineering works normally determines the conditions of contract, which define the obligations and performances by some form of competitive tendering and any contractor who submits a successful tender and subsequently enters into a contract is deemed in law to have voluntarily accepted the conditions of contract adopted by the promoter.

The obligations that a contractor accepts when he submits a tender are determined by the form of the invitation to tender. In most cases the tender may be withdrawn at any time until it has been accepted and may, even then, be withdrawn if the acceptance is stated by the promoter to be …subject to formal contract? as is often the case.

43. The conditions of contract are normally determined by ___c___.

a. the government official

b. the contractor

c. the promoter

44. This conditions define the obligations and performances to which __c____ will be subject.

a. the employer

b. the official

c. the contractor

45. The obligations that ___c___ accepts when he submits a tender are determined by the form of the invitation to the tender.

a. the employer

b. the auditor

c. the contractor

46. in most cases the tender may be withdrawn at any time until ___b___.

a. the promoter has enough money

b. it has been accepted

c. the tender approved by the government

Passage Five

Materials are usually described as …rock?, …loose rock?, or …common?, with …common? signifying all material not otherwise classified. Rock, sometimes called …solid rock?, nearly always must be drilled and blasted, then loaded with a front-end loader or power shovel into trucks or other hauling units. Blasted rock may be moved or drifted for short distances by means of a bulldozer, which is, in effect, a huge tractor-mounted blade. Loose rock often is dug with loaders or shovels without any previous blasting.

47. According to the passage, which material signifying all material not otherwise classified.

a. loose rock

b. common

c. rock

48. Which of the following is NOT true?

a. rock, is sometimes called …solid rock?

b. rock, is sometimes called …loose rock?