Scientists are trying their best to_______ ways to treat the terrible disease caused by Ebola(埃博拉).
| A.come up with | B.look forward to |
| C.talk about | D.give up |
Tom is of the two boys.
| A.tallest | B.taller |
| C.the taller | D.the tallest |
He is honest boy. And he is student in our class.
| A.a, better | B.an, best |
| C.the, the best | D.an, the best |
--- ______ do you play softball after school?
--- Twice a week.
| A.How long | B.How soon |
| C.How often | D.How much |
--- Is the Changjiang River in the world?
--- No, it isn’t.
| A.very long | B.longer |
| C.the longest | D.longest |
Tom often tells lies, but they always make us .
| A.believe | B.to believe |
| C.believes | D.believing |