Food safety is one of the problemsnow all over the world.
| A．discussed | B．to be discussed |
| C．being discussed | D．having been discussed |
What worried me most was to go abroad alone
| A．my not allowing | B．having not allowed |
| C．my being not allowed | D．my not being allowed |
When seeing the snake, she a scream.
| A．gave out | B．gave away | C．let go | D．let out |
No matter how bright a talker you are, there are times when it’s bettersilent.
| A．remain | B．to remain | C．having remained | D．to be remained |
It is requested that each of the teachers inviteda performance at the party.
| A．should give | B．will give | C．has to give | D．must give |