There is a crowd of people in front of the house over there. What do you suppose _____ there?
The information on the Internet gets around more rapidly than ______ in the newspaper.
When you study the local map, you’ll find this town is________.
This is the second time that I_______ London. The first time I_______ here was on Christmas Day last year.
--- How do you find Mr Li’s lecture? --- Good indeed. It_______ many problems we have come across in our study.
_____it is to jump into a river to swim on such a hot day.