—It’s necessary ____ our environment(环境).

—It’s necessary ____ our environment(环境).  —I agree with you.

#50553

protect（保护）

protecting

to protect

protects

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She asked us        that we were in a story.

#50634

imagine

to imagine

imagined

imagining

— What happened?— The owner changed his mind and refused 　　　　 his house.

#49284

sell

sold

selling

to sell

——Let’s _    to the movies now.   ——That         great.

#50474

going, sounding

go, sounds

go, sound

goes, sounds

Be sure ________ and tell me what happens.

#49799

writing

wrote

writes

to write

They have fun          chess（国际象棋）.

#50410

play

playing

play the

playing the

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