Their house . . be haunted ; they have lived there for several years and they have never seen anything unusual. can’t may mustn’t must

Their house can't be haunted ; they have lived there for several years and they have never seen anything unusual.

Объяснение:

Поскольку они жили и не замечали ничего особенного, в доме не может быть привидений. Сразу же фокусируем внимание на отрицательные формы. Их у нас две: can't и mustn't. Для обозначения невероятности чего-либо, предпочтительно can't (mustn't возможно, но характерно для American English). Потому, мой ответ: can't

Bill has been abroad only once. He went to Japan two years ago. He enjoyed his trip very much. He stayed in Tokyo and Osaka for a fortnight. At present the company is expanding its business. They are studying tourism and trade in Europe. They are planning trips to East European countries. They hope very much on successful business.
Билл побывал за границей только один раз. Он ездил в Японию два года назад. Поездка ему очень понравилась. Он пробыл в Токио и Осаке две недели. В настоящее время его компания расширяет свой бизнес. Они изучают туризм и торговлю в Европе. Они планируют поездки в страны Восточной Европы. Они очень надеются на успех своего бизнеса.

Everybody knows that sport is an important part of healthy lifestyle. Fortunately, there are many opportunities nowadays to do different types of sports. First of all, we always have lessons of physical education at school. Secondly, from the very childhood I attend martial arts, to be precise karate lessons. It’s one of my favourite types of pastime. I’ve had several teachers and all of them were highly professional. Another sport that I enjoy is swimming. I’m just an amateur, and I often go to the nearest swimming-pool. Luckily in summer I get a chance to swim in the open sea. I’m not the only sport lover in our family. My younger brother is also keen on sport. His favourite sport is tennis and he is really good at it. Besides doing sports, I like watching different games on TV. Every winter, for example, I watch figure skating, skiing and hockey championships. In summer I enjoy watching football and rowing. Besides active games, there are also some other types of games which also refer to sports, among them chess, backgammon, billiards, air hockey, bowling and others. When I have free time I do play these games with my friends. I don’t think there are any types of sport which I don’t like.