These continual _____ in temperature make it impossible to decide what to wear.
| A．alterations | B．vibrations | C．waves | D．fluctuations |
Can I really get a mountain bike as a reward if I win the race?
- Absolutely !__________.
| A．It all depends | B． I mean it | C． You've got me | D． So will you |
- Do you know ______ of them?
- No, I only know, Mr johnson and Mrs Smith.
| A．both | B．either | C．any | D．all |
—You were brave enough to argue with Mr. Smith. —Well, now I regret _______ that.
| A．to do | B．to be doing | C．to have done | D．having done |
Too much pressure from study leads to sleeplessness, which _______ increases the risk of forgetfulness.
| A．in turn | B．in return | C．by chance | D．by choice |
The gym is a public place, so you should be ________ and leave all the machines clean after using them.
| A．considerate | B．cautious | C．subtle | D．modest |