Charlie ______ be really difficult at times even though he’s a nice person in general.

—Excuse me. May I sit here? —I’m afraid you _________. My daughter will come back soon.

----Where is my watch? I _______ find it. ----Don’t worry. It must be somewhere in your room. 

 –Look! The boy is running fast! –He might ______ to catch a bus.

(2013·辽宁高考)Harry is feeling uncomfortable.He ________ too much at the party last night.