Rewrite the sentences.
1.The cost of installation is very high.Solar domestic heating systems are economical to use.(but)
........................................................
2.I'm practising speaking English a lot.I don't want to fail in the oral test.(because)
......................
3.She's working late next Friday.She can't come to the party.
................................
4.Nga asked me"What aspect of learning English do you find most difficult?"
Nga asked me.........................
5.Nick will bring the pizzas to our house.
Pizzas..........................................
6.They want to buy a lot of things.They are not rich.(although)
Although...............................
7."Are you leaving for Hanoi tommorrow morning,Lan"?
Hung asked........................
8.I can't go on a picnic with you because I am not free today.
If...................
9.The man is a real expect.He repaired my car yesterday.
The man.........................