So difficult did I find ___ to work out the problem that I decided to ask my partner for help.
| A．myself | B．us | C．it | D．that |
This is the best film __ we have seen this year.
| A．which | B．that | C．in which | D．for that |
He has a poor memory.He has forgotten ___ his dictionary while reading.
| A．carrying | B．taking | C．bringing | D．to bring |
They devote themselves to __ a new way to make populated water clean.
| A．finding | B．look for | C．find | D．having found |
Bamboo is ___ grass, but not tree.
| A．a type of | B．a pile of | C．a kind of | D．a piece of |
___ you succeed, you ___ many hours.
| A．Would, would give | B．Should, would be given | C．Could, would be given |
| D．Had, would be given |