Only those who have experienced hardship well aware of what happiness means.
| A．can they be | B．they can be | C．can be | D．they can |
Although he is only 14 years old, he __________drugs for two years.
| A．addicts | B．has addicted to | C．has addicted | D．has been addicted to. |
The children were not allowed ________ the house because it was being painted .
| A．entering | B．to enter | C．entered | D．enters |
We had to wait one and half hours _________ we had already booked a table.
A. since B. although C. until before
When we arrived the cinema, the movie ____________ for 20 minutes.
A. had started B had been on C. started D. is on
I don’ t believe he will come,__________?
A. won’t he B. will he C. do I D don’t I