---How did you work out the difficult chemistry problem?--- I worked it out by _______

---How did you work out the difficult chemistry problem?--- I worked it out by ________.

#49667

working with a group

think very hard

ask the teacher for help

doing oneself

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What is the best way you think of ______ the environment?

#51117

to protect

protecting

protect

protected

Jane likes singing.We often hear her ______ after class.

#49746

sing

to sing

sings

singing

 My mum did all she could ___money for my education at that hard time.

#48611

made

makes

to make

making

 —How dangerous!— Yes. I think the policeman should stop the children     soccer in the street.

#49790

play

playing

to play

plays

Tony thinks it is easy _________ English.

#49210

study

learns

to learn

studies

共1553题