_______,when Marx was already _______,he found it was important to study the situation in Russia, so he began to learn Russian.
| A．In 1870s, in his fifties |
| B．In 1870s, in fifties |
| C．In the 1870s, in fifties |
| D．In the 1870s, in his fifties |
He thinks playing computer games ________.
| A．frustrated | B．frustrating | C．frustrate | D．to frustrate |
Don’t put off today’s work for tomorrow. I mean , today’s work _____today.
| A．may do | B．must do | C．may be done | D．must be done |
May we leave the classroom now? No, you _____. You_____ to leave until the bell rings.
| A．mustn’t, are allowed | B．don’t have to , are supposed |
| C．needn’t , aren’t allowed | D．can’t , aren’t supposed |
----Mum, Can I have something______?
----Oh, dear . You can only drink some water. There is _____in the kitchen.
| A．to drink ，nothing else | B．drinking ，something else |
| C．to eat ，something else | D．eating， nothing else |
You are under 18 years old, so it’s _______for you to join Trail walker.
| A．impossible | B．meaningful | C．necessary | D．important |