Whenever I go to Beijing, ____ is quite frequent, I will go to visit the Great Wall.
The young man rushed out of the room, ______ into his car and started it hurriedly, ______ to get home as soon as possible.
______ is known to all is that the old scientist, for ______ life was hard in the past, still works very hard in his eighties.
The number of people present at the meeting ______ about one thousand, a large number of whom ______ experts from abroad.
—It is a long time ______ I saw you last. —Yes, and what a pity it is since it will be a long time ______ we see each other again.
The conference was held to discuss the effect that tourism has ______ the wildlife in the area.