The old teacher lay wide awake on his bed, ___________ all the problems he had to deal with the next day.
| A．thought about | B．to think about | C．thinking about | D．having thought about |
Even in winter the roadsides were places of beauty, _______ countless birds came to feed on the berries and on the seed heads of the dried weeds rising above the snow.
| A．which | B．when | C．where | D．what |
At sixty, Maugham decided to withdraw from the theater and wrote The Summer Up, in which he tried to review what he________ from his life and literature
| A．had learned | B．has learned | C．was learning | D．would learn |
I was once ashamed to admit my weakness, but now I have no such feeling and I________myself much discomfort.
| A．bring | B．offer | C．save | D．promise |
It was several minutes ____we realized what was happening-our dog was trapped in a newly-dug tunnel.
| A．since | B．before | C．until | D．while |
Many restaurant menus include the origins of adish, ____ it is prepared, what the main ingredients are, and which farms the ingredients come from.
| A．when | B．how | C．what | D．which |