Giúp em với 5 câu này ạ : 1 I know Tom __________________________ (SING) that song if you __________________________ (REQUES

Giúp em với 5 câu này ạ :
1 I know Tom __________________________ (SING) that song if you __________________________ (REQUEST) it.
2 The trip __________________________ (TAKE) a day if all __________________________ (GO) well.
3 What __________________________ (HAPPEN) to our children if nuclear war __________________________ (BREAK OUT)?
4 If it __________________________ (RAIN) tomorrow, I __________________________ (STAY) at home all day.
5 If you __________________________ (WANT) this pen, I __________________________ (LEND) it to you.