Whose guitar is this?   Susan plays the guitar. It must _______.

—Do you love reading Guo Jingming’s novels? —Of course I do，but I          them for a long time because I'm always busy．

-Steven, could you help me_______ when the plane will take off on the Internet? -I'm sorry, my computer doesn't work.

Listen! Can you hear someone              ?

Too much homework  can make us _______ or sad.