--Has Billy finished his homework today?
--I have no idea. He ______ it this morning.
| A．would do | B．was doing |
| C．has done | D．had done |
Only when _______ according to the directions strictly will the medicine work well.
| A．taking | B．to take | C．taken | D．being taken |
It is not immediately clear__________ the financial crisis will soon be over.
| A．since | B．what | C．when | D．whether |
I’d like my bedroom __________ according to the fashionable style of Europe and America.
| A．designed | B．to be designed | C．to design | D．to have designed |
When asked why he went there, he said he was sent there ________ for a space flight.
| A．being trained | B．training | C．to have trained | D．to be trained |
My mom’s __________ determined me to go on with my study.
| A．encourages | B．encouragement | C．encouraged | D．encourage |