You had better ________ some time every day for sports so that you can keep yourself energetic.
| A．spend | B．take | C．spare | D．give |
I won’t leave here until my mother _______ back.
| A．will come | B．is coming | C．came | D．comes |
We really don’t know _______. Could you help us?
| A．how to do | B．what to do |
| C．to do what | D．to do how |
—Will you please ________ do that? —OK, I won’t.
| A．won’t | B．not | C．don’t | D．can’t |
We had fun ________ the robots do many different kinds of things.
| A．to watch | B．watched | C．watching | D．watches |
The boss makes the workers ________ long hours every day.
| A．work | B．to work | C．works | D．working |