Doctors have said that as many as 50% of patients don't take medicine ________.
| A．like directed | B．to be directed |
| C．as directed | D．so that directed |
We last night, but we went to the party instead.
| A．must have studied | B．might study | C．should have studied | D．would study |
The reason_______ he didn’t come was that he was injured.
| A．that | B．why | C．because | D．when |
There is no doubt _________ the world climate has been changing in recent years.
| A．that | B．what | C．if | D．whether |
Will you help him________ you see an old man in trouble ?
| A．though | B．so | C．because | D．when |
I usually do my homework after dinner until 10 pm, ______ is my bedtime.
| A．who | B．what | C．which | D．that |