What a pity! Considering his ability and experience, he ____ have done better.

Mr Chen __________ his mobile phone to the shop because it can’t work at all.

 She is a quiet girl at school，but sometimes she _____ be very naughty.

—Tom graduated from college at a very young age.—Oh,he__________have been a very smart boy then.

(2013·江西九江二模)If you won't do as I tell you, you ________ get the chance to be promoted because the competition is just too fierce.