---- The woman biologist stayed in Africa studying wild animals for 13 years before she returned.---- Oh, dear! She _______ a lot of difficulties!
The work ____ be finished in such a short time .
— ____ he open the door ? — Yes , please .
— Do you have to take care of your mother at home ? — Yes , I ____ .
— You ought to have called her yesterday . — Yes , I know I ____ .
— Would you please go to the cinema with me ? — Yes , I ____ .