Most birds find it safe to sleep in the trees, but ________they have eggs or young chicks, they don’t use a nest.

A.why   B.how   C.unless   D.where

Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don’t use a nest.

   A. why       B. how      C. unless      D. where

Most birds find it safe to sleep in the trees,but_______they have eggs or young chicks,they don’t use a nest.

A.why                                                             B.how

C.unless                                                          D.where

Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they don’t use a nest.

A. why   B. how   C. unless    D. where

.Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they don’t use a nest.

A. why    B. how

C. unless D. where

Most birds find it safe to sleep in the trees, but ________ they have eggs or young chicks, they don’t use a nest.

   A. why            B. how            C. unless          D. where

Most birds find it safe to sleep in the trees, but ______ they have eggs or young chicks, they don’t use a nest.

   A. why           B. how              C. where                D. unless

1.  Most birds find it safe to sleep in the trees, but _____ they have eggs or young chicks, they don’t use a nest.

 A. why   B. how   C.unless   D. where

 Most birds find it safe to sleep in the trees,but_______they have eggs or young chicks,they don’t use a nest.

A.why                                   B.how

C.unless                                    D.where

Most birds find it safe to sleep in the trees, but ________ they have eggs or young chicks, they don’t use a nest．

1. A.
   why
2. B.
   how
3. C.
   unless
4. D.
   where