小题1:The government has taken action. Now there is _______pollution in the river.

小题2:Sandy is planning to hold a party to celebrate her father’s _________birthday.

小题3:I was happy that I finished my job __________.

小题4:Millie’s grandparents live in a flat not far from _________, she can often see them.

小题5:Peter and Judy keep in touch by ___________ emails.

变频器断路器断开后，约（）分钟直流母线电压才放电完毕，因此在放电完毕之前严禁打开变频器。

A.5

B.10

C.15

D.20