3речення в паст перфект і питання до них

1-Has he developed a new design of this machine?
2-Will she have written the report by Monday?
3-Is she conducting the experiment?
4-I don't use computers in my work
5-He was doing the calculations when the professor came.
6-Will you test your construction next week?
7-Had she left the laboratory before the work was finished?
8-Is your theory based on careful observations?
9-Should you start your work at laboratory in the morning?
10-We cant control this research without a computer.
11-Didnt we solve the problem two days ago? Или We didn't solve the problem two days ago. (Смотря если вопрос или отрицательное предложение)
12- She doesn't apply new methods of calculations.

The great Wall of China- Fortification in North China; grandiose monument of ancient Chinese architecture. Wall protyanlas from Jiayuguan (Gansu Province) to Liaodong Bay. The length, in one calculation is about 4 thousand km, on the other - more than 6000 km; height 6.6 m, in certain areas up to 10 m.Construction of the Great Wall of China was begun by Emperor Qin Shi Huang after the unification of China (221 BC. E.) To cover the north-western borders of the empire from the attacks of nomadic peoples. In the 3rd century BC. e. It was mainly built. Subsequently, the wall repeatedly completed and repaired. In its entirety the casemates were built to protect and guard towers, and at the major mountain passes - the fortress. Fully restored section of the Great Wall of China near Beijing.