The key________ the problem of traffic jams is to pay the “congestion charge” ________ by the mayor of London[ ]

We live in a society ______ there is a great deal of debate about competition.

country, ________ Britain,it has been said, can one experience four seasons in the course of a singleday.

.to go fishing with me -Sure,I’d love to.

the first time you _______ Beijing—-No But the first time I ______ here, the citywasn’t so beautiful