-Mum,may I go out to fly kites?
-Sorry.Please don’t go out___________your work is finished.
| A．after | B．while | C．till | D．since |
Look! The boys _______ football on the playground.
| A．plays | B．play | C．are playing | D．played |
This is _______ MP4. Yours is over there.
| A．my | B．me | C．I | D．mine |
Many accidents ______ by careless drivers last year.
| A．are caused | B．were caused | C．have caused | D．will cause |
I will send you an e-mail as soon as I ______ in Canada.
| A．arrive | B．arrived | C．am arriving | D．will arrive |
--- What were you doing this time yesterday?
--- I ______ on the grass and drawing a picture.
| A．sit | B．sat | C．am sitting | D．was sitting |