Don’t worry. He is _________to take care of little Betty.
| A．carefully enough | B．enough careful |
| C．careful enough | D．enough careful |
What did you buy during your last vacation? I __________ a hat.
| A．buy | B．buyed | C．bought | D．was buy |
--- ___________ there any sharks in the aquarium? --- No, we didn’t see any.
| A．Did | B．Had | C．Have | D．Were |
It’s not good for people __________ waste water (污水) into the river.
| A．to put | B．putting | C．to pour | D．pouring |
Every student in Miss Chen’s takes turns __________ the classroom every day.
| A．clean | B．cleans | C．cleaning | D．for |
Please tell your partner _____________ make your favorite smoothie.
| A．what to | B．how to | C．to how | D．to what |