She ______ very hard since she came to our school．
A．studies B．has studied
C．is studying D．studied
Even Tony’s six-year-old son asked him ______ smoking．
A．stops B．stopped
C．stopping D．to stop
The schoolboy ______ a blind man cross the street yesterday．
A．helps B．helped
C．will help D．has helped
— Can he jump high?— Yes, he ______． He is a good high jumper．
A．canB．needC．mustD．shall
It was dark, ______ I couldn’t see what was happening．
A．orB．thoughC．butD．so
I often go on holiday with my parents _____ summer．
A．onB．atC．inD．of
