21.enlarge=magnify(magnify means make something larger than it really is)
22.complex=intricate(if something is intricate, it often has many small parts and details)
23. Lonely=solitary (if someone is solitary, there is no one near him/her
24.small=minuscule(very small), minute,
25.praise=extol(stronger than praise), compliment(polite and political)
26.hard-working=assiduous(someone who is assiduous works hard or does things very thoroughly
27.difficult=arduous(if something is arduous, it is difficult and tiring, and involves a lot of efforts)
28.poor(soil)=barren, infertile(used to describe the soil is so poor that plants cannot be planted on it)
29.fragile=brittle, vulnerable(someone who is vulnerable is easily hurt emotionally or physically)
30.show=demonstrate (to demonstrate a fact means tp make it clear to people.)
（实习编辑：李沫）
