Đọc đoạn văn sau và chọn phương án đúng nhất (ứng với A, B, C hoặc D) cho mỗi chỗ trống.

Smart Shoes 

Smart shoes that adjust their size throughout the day could soon be available. A prototype has already been produced and a commercial (21).....may be in production within a few years. The shoe contains sensors that constantly check the amount of room left in it. If the foot has become too large, a tiny valve opens and the shoe (22).....slightly. The entire control system is about 5mm square and is located inside the shoe. This radical shoe (23).....a need because the volume of the (24)...... foot can change by as much as 8% during the course of the day. The system is able to learn about the wearer's feet and (25)......up a picture of the size of his or her feet throughout the day. It will allow the shoes to change in size by up to 8% so that they always fit (26)....... They are obviously more comfortable and less likely to cause blisters. From an athlete's point of view, they can help improve (27)......a little, and that is why the first (28).....for the system is likely to be in a sports shoe. Eventually, this system will find a (29)......In many other household items, from beds that automatically change to fit the person sleeping in them, to power tools that (30)......themselves to the user's hand for better grip.

Sử dụng từ trong ngoặc ở dạng thích hợp nhất để điền vào các chỗ trống.

Shadow puppetry is a traditional art form that often goes (41. appreciate).......in modem times. A large part of the (42. appealable).......of puppet shows is the (43. craft).......behind the creation of the actual puppets. In shadow puppetry, on the other hand, the puppets remain (44. see)......., so the real artistry is in the presentation. The combination of the puppets’ shape, the background screen, and the light itself creates the overall effect of the shadow puppet show. The task of the director is to ensure these elements are working together (45. harmony).......in order to produce the optimal experience for the audience. The screen is the medium through which the audience experiences the performance, so selecting the best screen is among great (46. essential)........ One unique challenge for the director is that the presentation is two-dimensional. The screen is flat, so puppets can only move forwards and backwards. Having chosen a screen and designed the set, the next step is to determine the light that will be used. There are several factors to be considered: (47. intense)......., spread, and angle. Therefore, finding the optimal (48. combine).......of light, shadow involves careful (49. plan)......and scrupulous design. Every detail must be controlled in relation to others, making shadow puppetry an art of (50. precise).......

Viết lại các câu theo gợi ý (kể cả những từ bắt đầu câu cho sẵn) sao cho ý nghĩa ban đầu của câu không thay đổi.

It's sad, but the crime rate is unlikely to go down this year.

Sad as .....................................................................................