Unless he () to help us, we shall lose the game.

单项选择题Come on, Harry, why stand there alone We'll go to play ballgames. How about () us

A．taking part in
B．joining
C．joining in
D．attending

单项选择题The citizens didn't feel safe at all after several families had their house () sat night and a lot of things stolen.

A．broken in
B．broken into
C．to be broken into
D．break in

单项选择题It is said that a grave of a middle aged man () about 2,300 BC was found by some English archaeologists in the year of 2002.

A．dating back
B．dated back to
C．dating back to
D．dated from

单项选择题—()do you visit your grandparents before —Every winter.

A．How long
B．How often
C．How soon
D．How much

单项选择题She told her neighbour that he () the well known scientist if he had attended the lecture.

A．could meet
B．might have met
C．might meet
D．would meet