One of the responsibilities of the Coast Guard is to make sure that all ships______followtraffic rules in busy harbors.

Not all birds can fly , ______ do all birds build nests.

Ifyou’resittingaroundalonelycampfireatnight,thehowlofawolfcansoundpretty______.

Mr.Johnson______rathernotinvestthatmoneyinthestockmarket.

Iwasshockedbythenumberofpeoplewhoseemedtohavenothingbettertodowiththeirtimethan______toknowfishbetter.