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Look! The police _______ after the thief.

A. is chasing B. chases C. were chasing D. are chasing

_______ UFO landed on Center Street and _______ alien came out.

A. A; a B. A; an C. An; a D. An; an

I heard that the alien _______ the Museum of Flight last week.

A. visit B. visited C. visit to D. visited to

?_______ were you doing when the alien came into the museum?

?I was reading a book.

A. How B. What C. Where D. Who

I _______ to the radio when my mother came in.

A.was listening B.listened C.am listening D.listen

I'm still hungry．Could I have _____ cake?

A．a(chǎn)nother B．other C．the other D．others

What _____ over there?

　　I don’t know．

　　A．happen　　

B．is happened　　

C．happened

D．happening

Mom，could I go camping with my classmates this Sunday?

　　Oh, let me _____ it．

A．look for B．find C．see D．think about

Betty couldn't find her son，so she _____ his name in the shop．

A．spoke　　B．shouted　　C．talked D．said

Sally was talking on the telephone _____ someone knocked at the door．

　　A．while　　B．before　　C．when D．a(chǎn)fter