It is known to all that ____ you exercise regularly, you won’t stay healthy.

________ is the most important for him is not his job, but his family.

 It remains to be seen ________ the newly formed committee's policy can be put into practice.

________they visited the Science Museum，they showed great interest in everything they saw.

　　　it is normal for parrots to talk, Einstein, a small bird, is unusual in that whenever she hears a new word or sound, she repeats it over and over until she masters it.