no nighttime
Yes it is spelled correctly
You spelled it correctly!
The word nite is more correctly spelled night.
You have spelled 'still' correctly.
Yes, engineer is spelled correctly in your question.
Flattest is spelled correctly. The others are spelled: silliest, biggest and sweetest.
Yes, surprisingly is spelled with an S. Surprisingly is how you spell it. You spelled it correctly.
You've spelled it correctly.
You spelled it correctly the first time: exclamatory
Convenience (easy access or availability) is correctly spelled.
yes, that is correct.
It should be foreign.