Mountain climbing is one of _______ sports in the world．（ ）
A．dangerousB．more dangerous
C．the most dangerous
You____stop when the traffic lights turn red．（ ）
| A． |
can't |
B． |
may |
C． |
must |
D． |
needn't |
Their parents don't allow them____in the river because it's really dangerous．（ ）
| A． |
swim |
B． |
swimming |
C． |
to swim |
D． |
swam |
Please_____the TV． It's time to go to bed．（ ）
| A． |
turn on |
B． |
turn off |
C． |
put on |
D． |
put off |
____people visited Hongyadong， Chongqing on May Day this year．（ ）
| A． |
Thousand |
B． |
Thousands |
| C． |
Thousand of |
D． |
Thousands of |
The cake_____delicious． I'd like to have another one．（ ）
| A． |
tastes |
B． |
looks |
C． |
sounds |
D． |
feels |