Scientists are now working _ humanoids(类人生物) because they can help people alot. [ ]

__________ does your father watch TV at night? — Never. [ ]

It’s important_____ a foreign language. —-I agree with you. We should study hard.

So little known _____ that soldiers had to ask for a guide.

You can’t _____ jeans to the party.If you do so, the teacher won’t let you ___.