Can you explain ________ the sun goes down in the west?
| A．why is it that | B．why it is that | C．how it is that | D．how is it that |
27．Let' s move all the products into the hall and_____them in a proper order．
| A．design | B．decorate | C．develop | D．Arrange |
26．The whole class_____searching for the missing boy when the heavy rain poured down
| A．was | B．were | C．had been | D．would be |
25．The other day,I remember, ____I bought the dress, I met my boss in the shopping mail
| A．when | B．which | C．that | D．Where |
24．----It's very cloudy and freezing cold．
----- Yes, I' m afraid it________be snowing tonight
| A．must | B．need | C．should | D．Might |
23．You shouldn' t come in here leaving the customers_________at the counter
| A．wait | B．to wait | C．Waiting | D．waited |