You _______ see a dentist when you have a toothache. 

---- Would you rather____there tomorrow?　 ----____ No. I’d rather he ____there instead of me. 

—Is Mary coming by plane?—He should ,but he _____not. He likes traveling by train.

(2013·成都一诊)The chairman ________ hold office for five years according to the constitution.

 I know you have eaten all sorts of junk food your mother and I probably _____ you have.