On June 2nd this year，________people celebrated the Dragon Boat Festival near the Songhua River．To our joy，there was little rubbish left．
A．thousands of
B．thousand
C．two thousands
—Do you know________？
—Sorry，I don’t know．
A．if she will come to the concert or not
B．whether she will come to the concert or not
C．if will she come to the concert
（安徽）As we all know，the Silk Road________China to the West in ancient times．
| A．connects |
| B．connected |
| C．will connect |
| D．is connecting |
Our teachers are very friendly to us．We________friends since three years ago．
A．have been
B．have become
C．would be
—Jack，I have________working out the math problem．
—Don’t worry．Let me help you．
A．fun
B．trouble
C．experience