These are my pants. His ____ yellow.

下列各句中，没有语病的一句是（ ）

There is no doubt that he is a good professor__________he is doing fine.

I was so familiar with her that Irecognized her voice ________ I pickedup the phone.

past few months, the country _____ a furthertightening of supply restrictions, making fuel and food supplies more difficultto obtain.