I didn’t quite follow him because he explained the theory _____that is too abstract for me.
I ______, but I was prevent by the heavy rain.
It was not until then that I came to know knowledge ____ only from practice.
I don’t really work here, I _____ until the new secretary arrives.
After the new technique was introduced, the factory produced______ tractors in 1998 as the year before.
There is no cause to tremble ______ his judge.