_____ lie in the sun for too long, _______ you will get sunburnt.

“If you are to succeed, you must put your shoulder to the wheel." my head teacher _______ says to the class.

 —I did very well in the English exam last week. —I did ______. I got a full mark.

Circus tigers, although they have been tamed, can _____ attack their trainer.

—Can you describe a distinctive characteristic of this animal?—Its neck can be extended ________ of its body.