My hometown ___ great changes in the past 10 years.
| A．happened | B．has happened | C．experienced | D．has experienced |
Although many of the houses in the small town ______ still in need of repair, there _____ lots of improvement in their appearance.
| A．are, has been | B．is, have been | C．is, are | D．are, was |
Susan decided not to work on the program at home because she didn’t want her parents to know what she______ .
| A．has done | B．was doing | C．had done | D．is doing |
The astronauts found that ______ the spaceship went further and further into space, it became more and more difficult to control its own movements.
| A．if | B．till | C．as | D．while |
What he said suggested he ______ angry with us so I suggest you ______ an apology to him.
| A．should be; should make | B．should be; made |
| C．was; make | D．was; to make |
Have you ever been to Mount Huangshan, ___________is famous for its pine forests and "sea
of clouds"?
| A．what | B．where | C．that | D．which |