Before a problem can be solved, it must be obvious ________the problem itself is.(2011·湖南)
| A．what | B．that | C．which | D．why |
The windows haven’t cleaned for a long time．They need ______.
| A．to clean | B．to be cleaned | C．cleaning | D．B and C |
–That would mean ____ a lot of time.
--Really? I don’t mean ____ any time.
| A．wasting; wasting | B．to waste; to waste |
| C．wasting; to waste | D．to waste; wasting |
____ the TV play, he got down to ____ his homework.
| A．Watching; do | B．After his watching; do |
| C．Watched; doing | D．Having watched; doing |
—Will you go skiing with me this winter vacation?
--- It __________________.
| A．all depend. | B．all depends. | C．is all depended | D．is all depending |
I lost my way. I wonder ________ I can turn in the dark.
| A．who | B．whom | C．to whom | D．for whom |