Not everyone has realized what ________important part the balance of ________nature plays in their life.
| A．an；the | B．/；the | C．an；/ | D．the；/ |
---- Hello, John. I haven’t seen you since we were at university.
---- ________. It’s been a long time.
| A．That’s all right. | B．All right. | C．That’s right. | D．Right enough. |
I have kept that photo ______ I can see it every day, as it always reminds me of the happy days in New York.
| A．which | B．where | C．whether | D．when |
Experts say walking is one of the best ways for a person to _______ healthy.
| A．maintain | B．stay | C．live | D．preserve |
If you want to ________ a pleasant visit, find out as much as possible about the manners and customs of your host country.
| A．ensure | B．deserve | C．secure | D．serve |
It’s true that the old road is less direct and a bit longer. We won’t take the new one, _______, because we don’t feel as safe on it.
| A．somehow | B．though | C．therefore | D．otherwise |