______is estimated that a round-trip to Mars would take more than a year.A,That B,what C,There D,It
, he wanted to buy his son a cheap toy for his birthday.
They considered a computer, which was considereda great help in their work.
---Is there anything wrong, Bob? You look sad. ---Oh, nothing much.In fact, I of my friends back home.
---Bill, would you like to go camping sometime this month? ---. ---Probably just the two of us.
–I wonder if you’d like to go to the cinema with me. —Well, , if you don’t mind.