—–I think the man over there must be Tom.—–It _____ be him. He has ______ to America.

 —I can’t find my mobile phone anywhere. —You _____ have lost it while eating out.

---I think _________________ in the morning is a good way to improve your spoken English. ---I agree with you.

I still remember my happy childhood when my mother ______ take me to Disneyland at weekends.

-- What’s wrong with your pen?-- The ink ___________ come out.