Studies show that the things that contribute most to a______of happiness cannot be bought．
| A．cause | B．thought | C．suggestion | D．sense |
Amy insists that she ____ the secret to lose weight. But she won’t share it with us.
| A．had discovered | B．discovers |
| C．has discovered | D．will discover |
We should make the world be aware of the fact that the land hunger ____ population growth before we carry out our population policy.
| A．contributes to | B．leads to | C．results in | D．results from |
Sue had her luggage _________ an hour before her plane left.
| A．check | B．checking | C．to check | D．checked |
My English name is Mary. Each of the students in our class _______ given an English name.
| A．were | B．was | C．has | D．have |
Doctors say that exercise is important for health, but it _______ be regular exercise.
| A．can | B．will | C．must | D．may |