1 . Wolves cannot climb a tree so when you ________ one, hide on the tree.

A．come across

B．come out

C．come about

D．come up

2 . At yesterday’s meeting, he______ a good idea to solve the pollution problem.

A．came across

B．came up with

C．came out

D．came about

3 . When you open a dictionary, you often ________a lot of unfamiliar words.

A．come about

B．come up

C．come out

D．come across

4 . In case we read and ______ some unfamiliar words and expressions, we can guess their meanings according to the context.

A．come out

B．come across

C．come through

D．come about

6 . Some people lose heart when they ________ failures while others rise to the challenge.

A．come out

B．come across

C．come up

D．come off

7 . The girl ______ some old photographs in a drawer when searching for her papers.

A．got across

B．came out

C．came across

D．lived up to

8 . One day I________ an old friend in the street who told me that his new book would ________ soon.

A．came across; come up	B．came about; come into being
C．came out; come about	D．came across; come out

9 . Large quantities of water in the lake have been polluted, terrible smell ______(come) out from time to time. (所给词的适当形式填空)

10 . I use my photography to make an impact on people, especially when it ________environmental issues.

A．comes on

B．comes out

C．comes to

D．comes up