Take a look at the following sentences,and decide which one is a good topic sentence. 1) Registering for college classes can be a frustrating experience for new students. 2) Driving on freeways requires still alertness. 3) The slang expression "so long"(meaning goodbye)is probably a corruption(误用) of the Arabic"salaam(问安)."Take a look at the following sentences, and decide which one is a good topic sentence. 1) Registering for college classes can be a frustrating experience for new students. 2) Driving on freeways requires still alertness. 3) The slang expression “so long” (meaning goodbye) is probably a corruption（误用） of the Arabic “salaam(问安)