Though _______ money, his parents managed to send him abroad.

—Whose schoolbag is this?—It ___________ be Mary’s. It has her name on it.

Mike ______have stolen the money from the bank,______he appeared to be rich overnight.

—A shy boy like John ________ give up a secure job and start his own business!—Yes，nobody had expected that. 

You ______ wear sports shoes when you climb a mountain.