I want to buy a pair of new trousers to ___ my sweater.

A. go with   B. go off   C. go on with   D. go in for

Edison had built a chemical lab of ___ when he was very young.

A. himself   B. him    C. itself     D.his own

---Beautiful day ,___? –Yes, ____?

A. is it, isn’t it   B. isn't it, it is   C. is itl is it   D. isn't it; isn't it

This soldier __ jump into the water and saved the boy.

A. do   B. did    C. does     D. done