Ⅰ.单句语法填空
1．He has thought of a good idea for the ________(promote) of his products.
2．Christopher Columbus is one of the most famous __________(explore) in history.
3．Nobody knows what the __________(deep) of the lake is.
4．__________(trap) in the burning building，many people could do nothing but wait.
5．With all the work __________(finish) ahead of time，I feel relaxed and very happy to be reading the papers.
