(   ) 3. When we go to the forest for a trip,remember not to        on our own.

   A. put out   B. go off   C. go down   D. go up

(   ) 2. The river is too wide. We can't swim        .

   A. among   B. across   C. through   D. between

(   ) 1. ―Someone is knocking at the door. Who        it be?

―It        be Tom. He is still in the school.

   A. can;can't   B. can;mustn't

   C. might;could   D. might;may

5. W        we see him,he wears a tie.

4. My sister has long s       dark hair.

3. You mustn't stand on the e       of the hill path. It's too dangerous.

2. She's s        . She'd like to have something to eat.

1. When going walking in the hills,we should wear p       clothes.

7. lead the way        8. begin with          

9. on one's own         10.  go rock climbing        

4. 迷路        5. 小心;当心        6. 一口气;一下子