As the _______ grows larger, the world itself seems to be smaller.
| A．population | B．pollution | C．problem | D．province |
--- Will Jim go hiking with us this weekend?
--- Maybe not. He _______ to visit his grandpa in the country.
| A．will decide | B．decides | C．has decided | D．decided |
There’s still an hour left, you _____ go in a hurry.
| A．must | B．needn’t | C．can | D．mustn’t |
---Have you seen Bill recently?
--- Oh, no! Nobody knows ______ he is! Everyone is looking for him.
| A．where | B．what | C．who | D．how |
---Do you still remember the first day we met at school?
--- Very clear _____ it was yesterday.
| A．as long as | B．as if | C．as soon as | D．as a result |