_______to sunlight for too much time will do harm to one’s skin. 

________ in a heavy rain should be an unforgettable experience.

“I hope the dialogue,” said the spokesman, “______ between the two presidents next week will give us some active signals. 

 It’s harmful for the students to spend too much of their time ______ computer games.

Entering the room,I found Mary____ at the desk and____ a letter.