One of the main themes of the summit was “sustainable development”,or the question _________ we can continue developing the world without damaging the environment.
Historical experience can as a most important source of information.
Have a good rest, you need to your energy for the tennis match this afternoon.
. It was so noisy out side that he couldn’t down to read.
He offered to her a hand as the suitcase was too heavy for her to carry.
----When did the concert ? ---Well, two or three years ago?