John hasn’t come yet, I don’t know _____.
| A．what has happened to him | B．when he came |
| C．what was wrong with him | D．where is he |
My house is about 25 _____ drive from the airport.
| A．minutes | B．minutes’ |
| C．minute | D．minute’s |
It’s said that the young trees along the river _____ two years ago.
| A．planted | B．was planted |
| C．were planted | D．are planted |
---I don’t know when he will arrive.
---Don’t worry. I’ll call you as soon as he _____.
| A．arrives | B．will arrive |
| C．has arrive | D．is arriving |
Mum didn’t go to bed _____ I came back home last night.
| A．until | B．while |
| C．though | D．because |