When asked ________ they needed most, the kids said they wanted to feel important and loved.

—Have you finished the book？
—No. I’ve read up to _____ the children discover the secret cave.

One should stick to ______one has begun.

Knowledgeable as he is, the expert was unwilling to offer advice to ______ he thought was not qualified.

----Why did you get so angry with Tom then?
----I had been waiting for _____ seemed for ages before he finally turned up.

The tourists can not help wondering ______ the ancient people could manage to complete the magnificent building without modern equipment.

Some students even have no idea of          they are studying, so they waste much time playing.

We should always bear in mind         many traffic accidents arise from drunk driving.

You must notice ______ the emergency exit is when you enter the building.

You must notice ____ the emergency exit is when you enter the building．