Exercises：

　　1. We are often told _____ at people in trouble.

　　A.not to smile B.to smile C. not to laugh D.to laugh

　　2. Would you please _____ the window? It’s too cold outside.

　　A.open B.opening C.not open D.not to open

　　3. She prefers to offer more money for a better TV set _____ less for this one.

　　A.rather than pay B.to pay C.not to pay D.to paying

　　4. My grandfather wants ______ around the world because he enjoys ______ new places.

　　A.traveling; seeing B.to travel; to see

　　C.to travel; seeing D.traveling; to see

　　5. My watch is broken. I want to know how to make it _____ .

　　A.work B.to work C.walk D.to walk

　　6. On her way home Lucy saw a thief ______ in a shop. She stopped _____ 110 at once.

　　A.steal; call B.to steal, call C.stealing, to call D.stealing ,calling

　　7. The teacher told Lucy ____ too much time _____ computer games.

　　A.not to spend, in B.to not spend ,on

　　C.didn’t spend, playing D.not to spend,playing

　　8. The girls were asked _____ go out at night.

　　A.to not to B.not C.not to D.do not

　　9. Jack is very funny.He always makes us _______ .

　　A.laugh B.laughing C.to laugh D.laughs

　　10. The headmaster told us ______ at the Science Museum on time

　　A.arrive B.arrives C.to arrive D.arriving

　　11. Look out! The traffic is moving fast. It’s _______ dangerous _____ cross the street.

　　A.very,to B.so,to C.much, to D. too , to

　　12. I’ve made it possible for my computers _____ the same programs by means of networking.