— Susan, would you like to go hiking with us this afternoon?— I'd love to, but I study for a test.A. may B. have to C. can
__________ is really hard _ _ them to climb such a high mountain.
We must _______ to help them out of trouble.
Must I go to a medical school and be a doctor like you ,Dad?No,you _______ .You’re free to make your own decision .
English isn’t as __________ as Chinese.Maybe, perhaps it’s just because Chinese is your native language.
What do you think of the price of gold in the world ?Nowadays it is getting much __________than before .