Have you ever been to ______ aquarium in Qingdao before?

In his lecture, the professor referred to the belief, in contrast to all other countries, ______the elderly are wise, ______is particularly dominant in the Chinese culture．

We need a more capable leader, ______ with strong will and as well as good humour.

Never touch my computer while I’m away． —Sorry, __________.

Though Tom just left school, ________ he went to studying at home.[ ]