I’d appreciate _______if you would like to teach me how to use the computer.
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.
One of the best ways for people to keep fit is to ________healthy eating habits.