用宾语从句合并句子1.can you tell me__the meeting begins?a.what b.whet

用宾语从句合并句子
1.can you tell me__the meeting begins?a.what b.whether c.when d.where
2.you will feel hurgry __you don't have breakfast.a.what b.why c.if d.how
3.do you know__jack left so early?a.what b.why c.until d.though
4.they will be thanful for__you have done.a.what b.that c.which d.who