Rare species in the world, ______ by hundreds every year, must be jointly preserved by all countries, or humans will encounter ecological disaster in the near future.
| A．disappeared | B．disappearing | C．disappear | D．having disappeared |
—I'll be away on a business trip. Would you mind looking after my cat?
—Not at all, _________.
| A．I've no time | B．I'd rather not |
| C．I'd like it | D．I'd be happy to |
The boy wanted to ride his bike in the street, but his mother told him _________.
| A．not to | B．not to do |
| C．not do it | D．don't |
Generally speaking, _________ according to the directions, the drug has no side effect.
| A．when taking | B．when taken |
| C．when to take | D．when to be taken |
I thought her honest _________ I met her.
| A．first time | B．for the first time |
| C．the first time | D．by the first time |
No sooner _________ he sat down to read the newspaper _________ the bell rang.
| A．do; when | B．did ； than |
| C．had ； then | D．had ； than |