The rapidly growing birth rate brings about a lot of environment problems, which the government is supposed to take _____.
| A．significantly | B．severely | C．earnestly | D．seriously |
Had your father seen the doctor earlier, he ___.
| A．would have died | B．would not have died | C．would not die | D．has not died |
Tom’s uncle must be an engineer, ___?
| A．mustn’t he | B．can’t he | C．isn’t he | D．needn’t he |
He ___ on the grass, looking at the clouds in the sky.
| A．is laying | B．is lying | C．has laid | D．has lied |
His mother ___ a lot of silkworms last summer.
| A．rose | B．fed | C．raised | D．grew |
You don’t __ to go there if you have no time.
| A．need | B．want | C．must | D．ought |