30. It is a good city for cycling because it is flat and ________is convenient for bikes.
| A．however | B．what’s more | C．therefore | D．Besides |
Oh, I’m not feeling well in the stomach .I so much fried chicken just now.
| A．shouldn’t eat | B．mustn’t have eaten |
| C．shouldn’t have eaten | D．mustn’t eat |
The naughty boy to me that the hen that there just now had two eggs the day before.
| A．laid; laid; laid | B．lied; lay; laid | C．laid; lay; lain | D．lied; laid; lain |
is even more important is the earth cooled down, water began to appear on its surface.
| A．When; that; when | B．What; whether; as | C．What; that; as | D．lt; whether; as |
Going on a trip intospace must be quiteexciting experience.
| A．/;the | B．the; the | C．the; an | D．/; an |
We the problem for a long time, but we didn’t reach any agreement.
| A．argued | B．explained | C．shared | D．communicated |