.If we humans beings continue to waste and destroy natural resources without using _____ energy, such as the energy from the sun, wind and water, our earth will be done for.
| A．alternative | B．solar | C．conventional | D．recycled |
It was not until I got home ________ I found my wallet missing.
| A．that | B．when | C．where | D．which |
Comrade Wang ________ be in Shanghai—I saw him in the company only a few minutes ago.
| A．mustn’t | B．can’t | C．may not | D．isn’t able to |
—Little Jim has been eating sweets all day.
—It’s no ________ he is not hungry
| A．matter | B．doubt | C．problem | D．wonder |
—You were out when I dropped in at your house yesterday.
—Oh, I________ for a friend from Beijing at the railway station.
| A．was waiting | B．had waited | C．am waiting | D．have waited |
─What are you reading, Jane?
─Some books on ________ education, I’m now interested in ________ education of young people.
| A．an; the | B．/; the | C．the; an | D．an；/ |