Tìm x , biết

$$\begin{gathered} a. -\frac{3}{5}-x=-0,75 \\ b. x+\frac{1}{3}=\frac{2}{5}-[-\frac{1}{3}] \\ c. 2\frac{1}{2}-x+\frac{4}{5}=\frac{2}{3}-[-\frac{4}{7}] \end{gathered}$$

$$\begin{gathered} d. 1\frac{4}{5}=-0,15-x \\ e. -\frac{4}{7}-x=\frac{3}{5}-2x \\ f.[\frac{3}{8}-\frac{1}{5}]+[\frac{5}{8}-x]=\frac{1}{5} \end{gathered}$$

III.Give the correct form of the verbs in the past tense.

1.   do              _____________________             11. buy      _____________________

2.   teach          _____________________             12. have     _____________________

3.   send           _____________________             13. take     _____________________

4.   spend         _____________________             14. go        _____________________

5.   begin         _____________________             15. make    _____________________

6.   cut             _____________________             16. think    _____________________

7.   put             _____________________             17. see       _____________________

8.   give           _____________________             18. eat       _____________________

9.   write          _____________________             19. sing      _____________________

10. be              _____________________             20. wear    _____________________

30: x và x < 8 ;