---Have you seen ____ pen ? I left it here this morning .---Is it _____ black one ? I think I saw it somewhere.
-Hello, Jenny. Your box looks so heavy. Let me give you a hand.-_______I'm OK.
His father had an important meeting just now, _______?
-_______ can the batteries (电池) keep these cool iPhones and iPads working?- For about ten hours.
- Have you heard that six people killed a young woman in McDonald's in Shangdong?-_______ bad the news is.
The careless boy lost his key, _______ he had to wait for his mom in the cold.