He _____ more than 5,000 English words when he entered the university at the age of 15.
| A．has learned | B．would have learned |
| C．learned | D．had learned |
He claimed _____my grandmother yesterday, but she passed away tens years ago.
| A．having met | B．to have met | C．meeting | D．to meet |
—Why didn’t Susan come to school?
—I don’t know. She____ ill.
| A．could be | B．may have been | C．might | D．must have been |
In front of the gate of the park ____ like an umbrella covering the entrance.
| A．an old pine tree stood | B．an old pine tree did stand |
| C．did an old pine tree stand | D．stood an old pine tree |
People’s attitudes towards gift giving may from country to country.
| A．adapt | B．shift | C．cover | D．vary |
The astronaut did many experiments in the spaceship, great help for knowing more about space.
| A．which we think it is | B．which we think is of |
| C．of which we think is | D．we think which is of |