12.　　 realize (v.)

11.　　 difficult (adj.) ---- difficulty / difficulties (n.) have difficulty / difficulties doing sth.

10.　　 strong (adj.)---- strength (u.n.)　 long ---- length　　 true ---- truth　 warm --- warmth

9.　　　 remind sb. of (doing) sth.

8.　　　 mind (n.) /　 (v.) mind (sb. / one’s) doing / mind if 从句

7.　　　 climate / weather (u.n.)

6.　　　 be satisfied / pleased / contented with…

5.　　　 relax (vt.) ---- relaxing / relaxed (adj.)

4.　　　 affect (vt.) ---- effect (n.) / influence

3.　　　 prefer to do sth.