Dangerously high speed
breakneck speed
Smile broadly and happily
beam
Unable to stop thinking about something / completely involved in something
obsessed / absorbed
extremely surprised or shocked
flabbergasted
Unable to speak because of shock or due to nervousness
words fail / tongue-tied
Make a sentence: heart sinks
(disappointed)
Make a sentence: pop up
(appear suddenly)
Make a sentence: numb
(unable to feel anything)
Make a sentence: flabbergasted
(greatly surprised)
Make a sentence: cram in
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Make a sentence: fuss about
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Make a sentence: keep your head
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