________ all of them are strong candidates, only one will be chosen for the post.[ ]

_______ delicious beef! —Well.You can eat more ifyou like it.

Everybody should study hard. No one can _______ us _______ a good future.

There was no sign _______ they had died from diseases such as bird flu – the main worry in such cases. Among the theories was _______ a truck had collided（碰撞）with the crowd.

Look! Tom is too sleepy to work．He _______ up watching TV．