It

---It’s rather cold in here. Do you mind if I close the window? ---____________.

---Excuse me, how much is the jacket? ---It’s 499 Yuan. ________.

It was a ____ for the mother to know that her son was killed by an accident

---Will he finish his work soon? ---Yes, he ____ it by next Monday

As the bus came round the corner, it ran __________ a big tree by the roadside.

The old lady was so angry to get the check that she _____ it up

He is quite sure that it’s _____impossible for him to fulfill the task within two days

A: Is your Web site for teachers or students? B: It’s about 50/50. There is a lot for both, and I try to keep _________.

——I’m so happy that you could come to English land with us for the holidays. ——_________ . It’s the first time for me to be out of china.

当8051单片机的TCON寄存器的IT0控制位为1时，外部中断0的触发信号为        。