--Jack's never worked hard at English, _______?-- _______ , so he can't answer the question in English, I think.
How much did the toys ___________ you?
The boy ___________ go to bed _________ his mother came back.
—You can’t smoke here . Look at the sign.—Sorry, I __________ it.
—Can you help me with my homework , David ?—______________
Jim writes __________ than ________ girl in his class.