You mustn't let your stocks run dry

[natasha]

Test No. incompl/advan-67 "Dry as you like", question 10

If you want to keep your customers coming in on a regular basis you mustn't let your stocks ......... dry.

(a) go
(b) turn
(c) take
(d) run

Test No. incompl/advan-67 "Dry as you like", answer 10

If you want to keep your customers coming in on a regular basis you mustn't let your stocks run dry.

Correct answer: (d) run

Your answer was: incorrect
If you want to keep your customers coming in on a regular basis you mustn't let your stocks turn dry.
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run dry

[Alan]

This means you have no more of a particular commodity. In other words you run out of something.
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English as a Second Language
You can read my ESL story Everything in the Garden is lovely