The police said that the accident happened _____ an early morning.
A. in B. on C. at
I can’t help you _____ you tell me what’s wrong.
A. because B. so C. unless
--- Cindy, you got home early today.
---Oh, we _____ have three classes in the afternoon, but today we had two.
A. usually B. seldom C. never
---What do you think of his______ ?
--- It’s great. If we follow it, we can finish the task in a short time.
A. question B. introduction C. suggestion
--Marry and Lisa, this is your classroom, right?
--- No. _____ is on the third floor.
A. Mine B. ours C. Hers
---You’ve dropped _____ “o” in the word “understood”!
---Sorry, I forgot ___ letter “o” is doubled.
A. an; the B. a; the C. an; a
