With the help of the smart phones, you ____ video chat with your friends on the phone.
I don't know _______ he will come tomorrow. ________ he comes, I'll tell you.
Icouldn't ____ these new words because I had no dictionary.
— It's dangerous to swim in this river.—Yes, you are right. The government has ___ people not to swim in it.
There are ___ floors in the building and my home is on the ____ floor.
— I am like a cat on hot bricks. There are so many problems that I don't know____ to deal with them.— Calm down first. Let's see what I can do for you.