I feel sure that ________ qualification， ability and experience，you are the most qualified one to do the job

The math problem is too difficult ,I can’t__________ .

Ten giant pandas are heading to the Shanghai Expo, _________ they will go on year-long display.

Do you know where David is? I couldn’t find him anywhere.—Well. He _________have gone far—his coat’s still here.

She overslept and was __ late that she missed the bus