. These students will graduate from the university next summer, ________ they will have studied here for four years.
| A．by then | B．by that time | C．by the time | D．by which time |
There the mother waved goodbye to her daughter until the train was ______________.
| A．out of sight | B．out of reach | C．out of order | D．out of date |
As the old man ____ dying in bed, he finally let out the secret about his daughter.
| A．lied | B．lay | C．laid | D．lain |
The strange-looking museum, _______ in the early 20th century, attracts about a million visitors from all over the world every year.
| A．build | B．building | C．built | D．builds |
It is required that passengers remain ________ when the plane is taking off or landing.
| A．sit | B．seating | C．sat | D．seated |
Yesterday my mother’s sleeve caught _____ fire while she was cooking us a delicious meal in ________ kitchen.
| A．a ; the | B．a ; / | C．the ; a | D．/ ; the |