.Have you sent that letter off yet? There’s something important I’d like to add ______ it.
Tom had no choice but to ________ an excuse to explain his being late.
--Go and ask Mr. White for help. --But I don’t know _____________.
--Jane, are you and your sister on a diet now? -- Yes, I want to lose some weight, and ______.
There is hard evidence ________ the accident was caused by his careless driving.
If ___________, I will go to her birthday party.