The invention of steam engine greatly sped up the industrial revolution, which _____ a lot to the take-off of the world. [ ]

Everybody is going to climb the mountain . Can I go too , mom — ______ Wait till you are old enough ,dear.

The newly-designed car is on show now. I wonder __________ .

________unusual music Li Yundi is playing!— Yes, all of the students are losing themselves in it.

How many teachers are party members in your school—Part members___________________ one fifth of thenumber of the teachers in our school