With a lot of difficult problems _________, the manager felt like a cat on hot bricks.
To prevent driving too long a time,we________ driving on the highway.
He said he was very busy,but ________he had nothing to do.
I don't know what to ________her recent behavior at all.
I could ________by the way she walked that her knee was still bothering her.
In many________,the new version is not as good as the old one.