Result for exam 2

一、1. think that, on Earth, millions of 
2. found life, planets yet 
3. have discovered, galaxies, universe 
4. to understand how, universe 
5. no one from, sent
二、1. did, do, listened 2. Have, returned , have, returned, is 
3. Have,seen, saw, has gone, will be
4. is doing 5. Have, had 6. will go , doesn’t rain 7. to close 
8. making 9. to climb 10. has gone
三、1. have, heard 2. heard from 3. It is, to 4. have been , for 5. How many times

四、1. seen 2. gone 3. before 4. came 5. got 6. got 7. from 8. did 9. had 10. and