15. It was with great joy _____ he received the news ______ his lost daughter had been found.
| A．because, when | B．which, that |
| C．since, how | D．that, that |
The new bridge is ______ the one built last year.
| A．three times width of | B．three times that of |
| C．three times the width | D．three times the width of |
You can’t imagine this lake used to be a beautiful place in our province.
| A．at any time | B．at one time | C．in no time | D．at times |
With a lot of problems _______, the principal decided to hold a meeting to have a discussion about them
| A．to solve | B．being solved | C．solving | D．solved |
He made up his mind to devote his life _____ pollution ______happily．
| A．to prevent; to live | B．to prevent; from living |
| C．to preventing; to live | D．to preventing; from living |
—What did your parents think about your decision?
—They always let me do _____ I think I should.
| A．when | B．that | C．how | D．what |