______ useful robot! It can help with the housework like a human servant.
A. What an B. What a C. What D. How
— What would you like to have for your birthday?
— Either noodles or bread ______ OK. I don’t mind.
A. am B. is C. are D. be
You will achieve nothing ______ you work hard in a proper way.
A. because B. if C. when D. unless
Paper cutting looks very easy ______ it may be difficult to do.
A. or B. so C. but D. for
The girls ______ how to dance a month ago and now they can dance well.
A. were taught B. will be taught
C. are taught D. have been taught
Tom ______ an experiment when someone knocked at the door.
A. does B. did C. is doing D. was doing
