It doesn’t matter _____ you pay in cash or by credit card in this store.

At the 60th anniversary, the guests sitting in the front are those ______ graduates from the university.

Some cities have passed laws that allow coal and oil_____only if their sulfur content is low.

No sooner _____ stepped out of the hall than it began to rain.

_____at the door before you enter the room, please.

（ ） I admit that she has shortcomings, I still like her.

The weather was good except for an （ ） shower.

The young man lost his job last month, but it wasn’t long _____ he found a new position in my company.

Because they are （ ） a date, many of us believe that they are in love.

I didn’t hear （ ） because there was too much noise where I was sitting.

Greatly agitated, I rushed to the apartment and tried the door, （ ） to find it locked.

When he really does something wrong, he is willing to （ ）.