With the development of science and technology, there is no doubt _________Chinese astronauts will land on the moon.
| A．whether | B．which |
| C．that | D．what |
—Will you come?
—________you promise not to invite Mary.
| A．As if | B．If only | C．Only if | D．Even if |
They ________ to enter the building by the back door; however, the front door was locked.
| A．are supposed | B．aren’t supposed | C．weren’t supposed | D．were supposed |
He _________his friend in the crowd at the first sight and called out his name.
| A．spotted | B．watched | C．observed | D．glared |
Used to TV shows, ________ everything is quick and entertaining, many people do not have the patience to read a book that requires thinking．
| A．which | B．what | C．where | D．when |
According to the government, the new tax law will not ________until next month.
| A．take effect | B．bring into effect | C．carry into effect | D．be for effect |