_____the cause of the oil leaks, the specialists can not draw a conclusion before completing a thorough and detailed investigation.
| A．With regard to | B．regardless of |
| C．In response to | D．In spite of |
If they _______ what I was saying, they'd know what I was talking about.
| A．took the trouble to listen to | B．had trouble listening to |
| C．take the trouble to listen to | D．have trouble listening to |
He ______ the math problem, his classmates wanted to help him out.
| A．sticking over | B．stuck | C．stuck with | D．sticking |
The little girl ________ to be a good singer if she gets good training in a music school.
| A．wishes | B．expects | C．promises | D．hopes |
I tried to ______ in my speech we were all grateful for his help.
| A．speak | B．tell | C．express | D．convey |
Buses have routes. They ________ and ________ people at different places on the routes.
| A．take on, get off | B．pick up, drop off | C．take up; take off | D．pick out; drop out |