11 Choose the best option A, B, C or D to complete the sentences below. If we have sky-cycling tubes in the future, the air ----------- better than it is today. A. is B. isn’t C. won’t be D. will be 12 Choose the best option A, B, C or D to complete the sentences below. If people ----------- the rules, there are no more accidents. A. remember B. follow C. obey D. take care of 13 Choose the best option A, B, C or D to complete the sentences below. There are ----------- cars in the street at this time because of the social isolation. A. less B. more C. much D. fewer 14 Choose the best option A, B, C or D to complete the sentences below. This morning I couldn’t go to work in time because of ----------- roads. A. supersonic B. solar-powered C. gridlocked D. high-speed 15 Choose the best option A, B, C or D to complete the sentences below. Many children in the slums have died from ----------- and disease. A. pick pocketing B. education C. malnutrition D. entertainment 16 Choose the best option A, B, C or D to complete the sentences below. When I drove past in my car, I saw him ----------- along the street. A. walk B. walking C. to walking D. to walk 17 Choose the best option A, B, C or D to complete the sentences below. People put pumpkin ----------- outside the homes during Halloween. A. lights B. neon signs C. lanterns D. bulbs 18 Choose the best option A, B, C or D to complete the sentences below. How ----------- is Anna going to stay in Hue city? – For five days. A. long B. far C. many D. much 19 Choose the best option A, B, C or D to complete the sentences below. A hydropower station ----------- in the North of the country next year. A. were built B. will be building C. will be built D. was built 20 Choose the best option A, B, C or D to complete the sentences below. We should put ----------- on our roof for the heating and hot water. A. solar energy B. equipment C. solar panels D. sun