Li Lei has not yet answered my question______I can go with him to________he calls the Natural Underground Gallery next week.
He was barking ____ let him in.
_____ all that has been said, the tourists have been picking leaves.
_____ is known to everybody is ____ the moon travels round the earth once a month.
Tom ____ desperate in front of the locked door.
The science of medicine, _____ progress has been very rapid lately, is perhaps the most important of all the science.