1. popular

Cấu trúc: S + tobe + MORE + adj dài + O

2. printers <máy in 3D>

Sau danh từ 3D là một danh từ -> cụm danh từ <Noun Phrase>

3. people

Cấu trúc: S + tobe + V_ing

Ta thấy trước tobe chưa có chủ ngữ -> thiếu

Mà có 2 danh từ có thể làm chủ ngữ: people, Scientists -> Mẹo: ta thấy có từ Some trước ô trống đúng không? Thế thì từ đằng sau viết thường -> chọn people

4. blender <máy xay sinh tố>

Hoàn cảnh câu đang nói về đồ dùng trong bếp

$#Đáp án$

 $1,$: popular

$2,$: printers

$3$: scientists

$4$: blender

→Cụ thể:

3D printing is becoming more and more popular. We are now able to print things such as clothing, prosthetic limbs, musical instruments and prototype cars. People and businesses are able to create the things they need very quickly and easily using 3D printers.

But can you imagine printing food? Some scientists are trying to revolutionise the dining experience by doing this. They hope that having a 3D printer in the kitchen will become as commonplace as the microwave or blender. Scientists say that they are easy to use: you simply have to select a recipe and put the raw food 'inks' into the printer. You can also modify the instructions to make the food exactly how you want it. This means that it would be very quick and easy to create tasty and nutritious meals.

@ngonhu16122008