2 . If left alone outside, dogs and cats can be very smart in__________(they) search for warm shelter. (所给词的适当形式填空)

3 . It has become a cultural landmark of the Yellow River Basin where visitors can view the river passing through the city and watch exhibitions showing ________ (it) long history’ and diverse cultures. (所给词的适当形式填空)

4 . Unlike _______ (it) seemingly simple appearance, making a guqin is extremely demanding. (所给词的适当形式填空)

6 . “This really excites scientists,” Carle Pieters, a scientist at Brown University, says, “because it means we have the chance to obtain information about how the moon is constructed.” Data about the moon’s composition, such as how much ice and other treasures it contains, could help China decide whether ________ (it) plans for a future lunar (月球的) base are practical. (所给词的适当形式填空)

7 . ... in the visitor’s memory. It sure does in ______ (I). While you’re in China, Mount Huangshan is a must to visit! (所给词的适当形式填空)

8 . —Is it ________ mobile phone?
—No, it isn’t. ________ is left in the office.

A．you; I

B．your; My

C．yours; Mine

D．your; Mine

9 . As kids want to see Las Vegas and all _________ (it) many attractions, we are going to spend our summer holiday there this year.(所给词的适当形式填空)

10 . The third quality of literature, coming out of the other two, is __________(it) permanence. (所给词的适当形式填空)