=\(=-6988-45-\left(-133\right)=-7033-\left(-133\right)=-6900\)

\(=\left(3^{2020}.3+24.3^{2020}\right):3^{2019}=3^{2020}\left(3+24\right):3^{2019}=3^{2020}.27.3^{2019}=3^{2020}.3^3:3^{2019}==3^{2023}:3^{2019}=3^4=81\)

\(=39+\left(-13\right)-101=26-101=-75\)

6. I (be) ........have been............... to London three times

7. They (walk) ...........have walked................... for more than 2 hours

8. This is the second time I (meet) ..........have met................... him

9. It (rain) ...........has rained............. since I stopped my work

10. Have You (get) ..........got........ married yet?

\(=10\text{a}+\text{a}=11\text{a}\)

\(\dfrac{3}{4}-\dfrac{5}{6}< \dfrac{x}{12}< 1-\left(\dfrac{2}{3}-\dfrac{1}{4}\right)\\ \dfrac{3.3}{4.3}-\dfrac{5.2}{6.2}< \dfrac{x}{12}< 1-\left(\dfrac{2.4-1.3}{12}\right)\\ \dfrac{9-10}{12}< \dfrac{x}{12}< 1-\dfrac{5}{12}\\ -\dfrac{1}{12}< \dfrac{x}{12}< \dfrac{12-5}{12}\\ -1< x< 7\)

=> x = { 0,1,2,3,4,5,6}

\(=15-13+9=2+9=11\)

1. They(not give) .........haven't given hisdecision yet

2. Has He (write) written ............................ his report yet?

3. We (travel) .......have travelled................ to NewYork lately

4. She has already (watch) .....watched.................... his movie

5. Tracy (not see) ...................... her friend for 2 years

All the flights were cancelled because of fog