Vitamin C helps our bodies make a special chemical, which _______ affects our brains, making us feel happy.
| A．in all | B．in turn | C．in advance | D．in short |
These tax laws which are intended for domestic companies do not _____ to foreign companies.
| A．contribute | B．lead | C．apply | D．fit |
The film is very humorous but______can be enjoyed unless you understand English culture.
| A．everything | B．something | C．nothing | D．anything |
---Your composition is full of mistakes.
---I wish I______more careful.
| A．would have been | B．had been | C．would be | D．were |
______life began on the earth is one of the biggest puzzles to scientists.
| A．How | B．What | C．Where | D．That |
---Let’s throw a surprise party for mom’s 50th birthday.
---That’s a good idea．We______several of her friends.
| A．invite | B．have invited | C．are inviting | D．will invite |