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16 - a) I'll
This is the correct answer because the person speaking is suggesting that if the projector doesn't arrive by tomorrow, they will take action and call the supplier. The future tense "I'll" is used to express their willingness to make the call.

17 - b) doesn't
This is the correct answer because the person speaking is talking about the possibility of the projector not arriving by Friday. They are using the present simple tense to express a general fact or something that is true now. The correct form to use with "it" is "doesn't" which is the third person singular form of the present simple tense of the verb "to do."

18 - a) have
This is the correct answer because the person speaking is talking about the lack of a spare projector. They are referring to a current situation where they don't have a spare projector. The correct form to use here is "have" which is the present simple tense of the verb "to have."

19 - c) – (no answer)
This is the correct choice because the person speaking is suggesting that the reliable supplier would inform them if there was a problem. They are not using a verb form to complete the sentence, so the correct choice is to leave it blank ("-").

20 - b) won't
This is the correct answer because the person speaking is contrasting the current reliable supplier with the old supplier. They are suggesting that if it was the old supplier, the person they are speaking to would not be as confident. The correct form to use here is "won't" which is the contraction of "will not," indicating a future negative action or state.

1. False. English industrial prosperity rested on a few important products, such as textiles, coal, and heavy machinery in the past, not currently.
2. Not mentioned in the text, so it cannot be determined whether this statement is true or false.
3. False. Newcastle is famous for its coal industry, not shipbuilding industry.
4. True. The central counties of England are indeed famous for the production of machinery, coal, motorcars, and chemicals.
5. False. Washington is not mentioned in the text, so it cannot be determined whether this statement is true or false.
6. True. Leeds is indeed a center of the clothing industry producing woolen articles.