He seems too tired today, and I wonder__________ he got a good sleep last night.
Beijing has ________ many buses that there is often a traffic jam in rush hours,
Hurry up, ________ you will miss the train. It's leaving in ten minutes.
Not only his parents but also his brother ________ to the Summer Palace. They haven't been back.
You'd better do it ________ your mother did.
______ they are brothers, they don't look like each other at all.