The country has already sent up three unmanned spacecraft，the most recent ________ at the end of last March.
| A．has been launched | B．having been launched |
| C．being launched | D．to be launched |
What they need ______ enough money, while what we need ______ enough workers.
| A．is; is | B．are; are | C．is; are | D．are; is |
– Do you know William failed the exam, Jenny?
-- _____? As far as I know, he is always working hard.
| A．So what | B．How come | C．Why not | D．What for |
When you communicate with people, it is not unusual to find yourself in a situation ____ you have to politely decline an offer.
| A．where | B．which | C．what | D．why |
Not until Betty got to the airport _____ she had lost her tickets.
| A．that she realized | B．did she realize | C．where she realized | D．she realized |
____ has been proved again and again that ____ is said in the ads greatly affects people’s impression of the products.
| A．There; what | B．There; that | C．It; which | D．It; what |