To protect the environment，we are trying our best to make our school a________ school.

ber how we met for the first time,Dick —Of course I do．You ______ to the teachers’office hurriedly and ______ me．

Exploring ________ space is exciting, yet dangerous.There is _______need for both robots and humans for space exploration.

I _____ read this book _____ I understand it.— You are great, I should learn from you.

by the clear waters, this forest providesvisitors with a wonderful chance to see some endangered native birds in thewild.