The traditional view is ________ we sleep because our brain is “programmed” to make us do so.
| A．when | B．why | C．whether | D．that |
The item you requested yesterday is no longer available and ________ we are returning your cheque.
| A．therefore | B．altogether | C．otherwise | D．moreover |
I kept looking at the man wearing a pair of glasses, wondering ________.
| A．whether did I borrow his book | B．where I had seen him before |
| C．what I knew his wife | D．when had I helped him |
It was not until last year ________ he got in touch with his father in Canada.
| A．where | B．what | C．how | D．that |
Every morning at a ________ time after breakfast she gave him an hour’s lesson.
| A．busy | B．patient | C．convenient | D．present |
________ their service, the workers of the hotel are active in learning English.
| A．Searching | B．Informed | C．To improve | D．Having caused |