Can you imagine the astronauts’___________ in space？
| A．to walk | B．to be walking | C．walking | D．to have walked |
________ is where he gets all his money from.
| A．What I can’t understand it | B．That I can’t understand |
| C．What I can’t understand | D．Which I can’t understand it |
He kept looking at her, wondering whether he _____ her somewhere.
| A．saw | B．has seen | C．sees | D．had seen |
--- I didn’t go to class last night because my car broke down.
--- You _______ mine. I wasn’t using it.
| A．could borrow | B．may borrow |
| C．could have borrowed | D．may have borrowed |
Helen _______ it if she doesn’t want to.
| A．doesn’t need do | B．need not to do | C．needs not to do | D．need not do |
--- Are we about to have dinner?
--- Yes, it _______ in the dining room.
| A．is serving | B．serves | C．is being served | D．served |