I predict he will be an engineer _____ten years, because he is so interested in engineering.
It’s _____ turn _____ now.
I can’t mend the car your help.
— _______ are they doing?一They are running.
一Do you have _______pens in the pencil case?一No,I don’t have _______ .
.It’s best to plant trees(植树)in _____.