Stressful environments lead to unhealthy behaviors such as poor eating habits, which _____ increase the risk of heart disease.
| A．in turn | B．in return | C．by chance | D．by turns |
— How are the team playing ?
— They are playing well, but one of them _____ hurt.
| A．got | B．gets | C．are | D．were |
This is Ted’s photo. We miss him a lot. He ______ trying to save a child in the earthquake.
| A．killed | B．is killed | C．was killed | D．was killing |
John and I _____ friends for eight years. We first got to know each other at a Christmas party. But we _____ each other a couple of times before that.
| A．had been; have seen | B．have been; have seen |
| C．had been; had seen | D．have been; had seen |
Visitors ______ not to touch the exhibits.
| A．will request | B．request | C．are requesting | D．are requested |
Selecting a mobile phone for personal use is no easy task because technology ____ so rapidly.
| A．is changing | B．has changed | C．will have changed | D．will change |