With the loud noise going on in the workshop, I can hardly on my lessons．
| A．put | B．rely | C．concentrate | D．center |
---Let's have a rest, shall we?
--- Not now. I don't want to stop _______ the letter yet.
| A．write | B．to write | C．writing | D．and write |
---This physics problem is too difficult. Can you show me __________, Wang Lin?
--- Sure.
| A．what to work it out | B．what to work out it |
| C．how to work it out | D．how to work out it |
--- How can I improve my spoken English?
--- You have to practise ______ as much as you can.
| A．speak | B．speaking | C．spoken | D．to speak |
--- How about going hiking this weekend?
--- Sorry. I prefer _______ rather than _______.
| A．to stay at home, go out | B．to go out, stay at home |
| C．staying at home, go out | D．going out, stay at home |
The teacher asked the students ________.
| A．if they were interested in dinosaurs | B．when was Albert Einstein born |
| C．what they will do with the computers | D．how many trees they have planted |