When spring comes，trees begin to _____ green．（ ）
| A． |
sound |
B． |
taste |
C． |
keep |
D． |
turn |
Helen sings every day ，it seems that she likes very much．（ ）
| A． |
sports |
B． |
music |
C． |
fruit |
D． |
vegetables |
you smile at others， they will smile back．（ ）
| A． |
If |
B． |
So |
C． |
Or |
D． |
Though |
We enjoyed __ at English party last weekend．（ ）
| A． |
us |
B． |
our |
C． |
ours |
D． |
ourselves |
The environment here becomes better and better． birds are coming back．（ ）
| A． |
Hundred |
B． |
Hundreds |
| C． |
Thousand |
D． |
Thousands of |
More trees every year to make our city greener．（ ）
| A． |
is planted |
B． |
are planted |
| C． |
was planted |
D． |
were planted |