Someone my umbrella. It’s wet and it was wet in the last few days.
| A．was using | B．must have used |
| C．has been using | D．has used |
He said that he didn’t know ______ to deal with the matter, so I left.
| A．what | B．when | C．where | D．how |
The way of life he was used to _______ when he came to study in America.
| A．change | B．changed | C．changing | D．being changed |
He said that we should protect the ancient civilization from _______.
| A．losing | B．lost | C．being lost | D．to lose |
She told us what she bought yesterday ________ a few apples and some clothing.
| A．is | B．are | C．was | D．were |
Do you know that Yuan Longping is known as ______ father of hybrid rice (杂交水稻)?
| A．/ | B．the | C．a | D．an |