1. We don't have a car but we are going to buy one.
2. When I called Lucy, she was on the bus. [В английском языке "ON the bus" не подразумевает того, что объект находиться на крыше автобуса. Вот такой парадокс]
3. I'll meet you at the cinema. ['Я встречу тебя у кинотеатра'. 'In the cinema' звучит для меня, как будто встреча произойдёт в самом кинозале, что маловероятно.]
4. There is a spider on the bathtub. ['On the bathtub' звучит неестественно]
5. Why did you go to the opticians?
1) to has my eyes tested [Нет]
2) to have my eyes tested
3) to make a test of my eyes [Нет]
6. They covered the goods with canvas lest they be damaged by rain.
[Be damaged - это сослагательное наклонение (subjunctive). Найдите в интернете подробнее, если хотите, ибо ссылки здесь запрещены, а своими словами это немного сложно объяснить]
7. His (-) father in laws book was published abroad.
"После my/his/her и таких местоимений разве стоит артикль?". Нет, нет и ещё раз нет.
1 When will the first restaurant be opened on the Moon?
2 aren't grown
3 Has the room been cleaned yet?
4 will have already been published.
5 Are they being repaired now?
6 will be announced
7 had been done
8 be watered
9 what kinds of medicine are usually made from plants?
10 has been produced
11 When was the first car constructed?
12 the text had already been translated
13 is being built
14 be cleaned
15 was being moved
16 were bought
17 ... have been found
18is ruled
19 the film was still discussed.
20 will have been written