In order to make our city more beautiful，we have planted _______ trees these years in Yiyang．（ ）
A．three thousandsB．thousand of
C．thousands of
— I'm afraid that we can't the math problem the teacher helps us.
— That's true.It's too difficult.
A．work on；ifB．work on；unless
C．work out；ifD．work out；unless
— Which country has a population，China or Canada？
— China.Canada is a lot crowded than China.
A．bigger；lessB．bigger；more
C．smaller；lessD．smaller；more
If you want to be a doctor like Zhong Nanshan，hard work is the key to .
A．treasureB．beautyC．successD．health
My mother will be years old next week.I'm planning to buy a gift for her birthday.
A．fourty；fourtiethB．forty；fortieth
C．fourty；fortiethD．forty；fourtieth
The two books are about English.You can choose of them to read.
A．all；bothB．all；either
C．both；eitherD．both；neither