Butterflies ________ a sweet liquid produced by flowers, which bees and other insects collect.

_______ of the students here _______ from the countryside.

A(n) _____ of achievement clearly has an influence on children’s early education.

 In my opinion, it's the flying birds rather than the pilot that________for the air crash.

 ---I’m going to the supermarket, let me get you some fruit.---OK. Thanks for your _____________.