It’s really unwise of some teenagers from low-income families to spend a large sum of money on Apple products ______ they could buy other cheaper brands.
On his way home, he found a wallet ____ on the ground, which he picked up and ____ in his schoolbag.
Could it be in the restaurant in ____ you had dinner with me yesterday ____you left behind your keys and wallet?
There is no need _______ and it’s no use __________ there too early.
The air is deadly polluted because some factories don’t__the rules to protect the environment.
------Is your father a teacher of English in the No.l Middle School? -------No! But he _________ English there for ten years.