I still remember ____ it was, he told me, ____ I could solve this kind of problems.
My dictionary _________, I have looked for it everywhere but still ________ it.
The students ________ busily when Miss Brown went to get a book she ______ in the office.
By _____, water can be changed into gas.
Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.
You will see this product made in this factory _____ wherever you go.