You didn’t sleep well last night, didyou— , soI feel tired now.

下列各句中．没有语病的一句是 ( )

68 It was at four o’clock in the afternoon____ he and his grandpa reached the museum in Guanghan

______, he can speak three foreign languages fluently.

If you try your best to study, I think it quite _____that you will catch up with other students