[ Idioms ]
To let something become less hot is the same as to let it ___ down.
a. lie
b. cool
c. tone

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Modal Verbs › ViewYou _______ been exhausted after working for 12 hours straight.
A. could have
B. must have
C. might have
D. should have
Grammar › View
When we talk about future plans, we use the ___________ verb tense.
A. present continuous (-ing)
B. past perfect (had + past participle)
C. simple present
D. simple future