They stayed with me three weeks, _____ they drank all the wine I had.

—Do you remember          he came?—Yes, of course. He came by train.

When was ______ that the suggestion was put forward ______ the seven-day Labor Day Golden Week holiday be cancelled?

 I saw some trees the leaves of _____ were black with disease. 

I can think of many cases _______ students obviously knew a lot of English words and expressions but couldn’t write a good essay.