21. fear to do sth. 惧怕做某事 She fears to live on the mountain. 她害怕住在山上。 22. prepare to do sth. 预备做某事 They prepared to go hiking this Sunday. 他们准备周日去远足。 23. pretend to do sth. 伪装做某事 She pretended not to see me. 她假装...